v3.26.3
Investment Risks
Sep. 18, 2026
YieldMax(R) ASTS Option Income Strategy ETF | Underlying Security Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Underlying Security Risks. The Fund invests in options that are based on the share price of ASTS. This subjects the Fund to certain of the same risks as if it owned shares of ASTS, even though it does not. By virtue of the Fund’s investments in options that are based on the value of ASTS, the Fund may also be subject to the following risks:

 

YieldMax(R) ASTS Option Income Strategy ETF | Indirect Investment in ASTS Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Indirect Investment in ASTS Risk. ASTS is not affiliated with the Trust, the Fund, or the Adviser, or their respective affiliates and is not involved with this offering in any way and has no obligation to consider your Shares in taking any corporate actions that might affect the value of Shares. Investors in the Fund will not have voting rights or influence over the management of ASTS but will be exposed to the performance of ASTS (the Underlying Security). Investors will also not have the right to receive dividends or other distributions from ASTS, but will remain subject to price fluctuations and other risks associated with ownership of the Underlying Security.

 

YieldMax(R) ASTS Option Income Strategy ETF | ASTS Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASTS Trading Risk. The trading price of ASTS may be subject to volatility and could experience wide fluctuations due to various factors. Short sellers may also influence ASTS’s trading activity, contributing to market instability. Public perception and external factors beyond the company’s control may influence ASTS’s stock price disproportionately. Additionally, following periods of market volatility, companies have faced securities class action litigation. Any adverse judgment or future stockholder litigation could result in substantial costs and divert management’s attention and resources. In the event of a trading halt, delisting, or significant disruption in the market for ASTS’s shares, the Fund may experience difficulty entering, modifying, or liquidating its exposures. These conditions could impair the Fund’s ability to achieve its investment objective, result in significant tracking error, or, in extreme cases, force the Fund to liquidate entirely.

 

YieldMax(R) ASTS Option Income Strategy ETF | ASTS Performance Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASTS Performance Risk. ASTS may fail to meet its publicly announced guidelines or other expectations about its business, which could cause the price of ASTS to decline. Correctly identifying key factors affecting business conditions and predicting future events is inherently an uncertain process, and the guidance ASTS provides may not ultimately be accurate. If ASTS’s guidance is not accurate or varies from actual results due to its inability to meet the assumptions or the impact on its financial performance that could occur as a result of various risks and uncertainties, the market value of common stock issued by ASTS could decline significantly.

 

YieldMax(R) ASTS Option Income Strategy ETF | ASTS Investing Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASTS Investing Risk. ASTS faces risks unique to its operations including, among others, supply or manufacturing delays, increased material or labor costs or shortages, reduced demand for its products, product liability claims, and the ability to attract, hire and retain key employees or qualified personnel. The trading price of ASTS common stock historically has been and is likely to continue to be volatile. Additionally, a large proportion of ASTS’s common stock has been historically and may in the future be traded by short sellers which may put pressure on the supply and demand for its common stock, further influencing volatility in its market price. ASTS is a highly dynamic company, and its operations, including its products and services, may change.

 

YieldMax(R) ASTS Option Income Strategy ETF | ASTS Operations, Regulatory and Key Person Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
ASTS Operations, Regulatory and Key Person RiskASTS’s space based cellular network continues to be developed and there can be no assurance that it will complete such network and related infrastructure, products and services on a timely basis, on budget or at all. Design, assembly and launch of satellite systems are highly complex and historically have been subject to frequent delays and cost over-runs. ASTS has a limited operating history and operates in a rapidly evolving industry, making it difficult to project prospects for future profitability. ASTS also has a history of losses and may never become profitable, and its success is dependent on multiple factors outside of its control. ASTS has contracted with government entities to provide services, and such customer relationships are subject to risks including early termination, audits, investigations, sanctions and penalties. Its business is subject to extensive government regulation worldwide, and its ability to provide services to its customers and generate revenues could be harmed by adverse government regulatory actions. ASTS is highly dependent upon its founder and chief executive officer, and if it is unable to retain him, or unable to attract and retain other key employees, its business could be adversely affected.

 

YieldMax(R) ASTS Option Income Strategy ETF | Technology Sector Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Technology Sector Risk. ASTS operates withing the technology sector, and the market prices of technology-related securities tend to exhibit a greater degree of market risk and sharp price fluctuations than other types of securities. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices. Technology securities may be affected by intense competition, obsolescence of existing technology, general economic conditions and government regulation and may have limited product lines, markets, financial resources, or personnel. Technology companies may experience dramatic and often unpredictable changes in growth rates and competition for qualified personnel. These companies are also heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely impact a company’s profitability. A small number of companies represent a large portion of the technology industry. In addition, a rising interest rate environment tends to negatively affect technology companies, those technology companies seeking to finance expansion would have increased borrowing costs, which may negatively impact earnings. Technology companies having high market valuations may appear less attractive to investors, which may cause sharp decreases in their market prices.

 

YieldMax(R) ASTS Option Income Strategy ETF | Diversified Telecommunication Services Industry Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Diversified Telecommunication Services Industry Risk. Telecommunication companies are particularly vulnerable to the potential obsolescence of products and services due to technological advancement and the innovation of competitors. Companies in the diversified telecommunications services industry may also be affected by other competitive pressures, such as pricing competition, as well as research and development costs, substantial capital requirements and government regulation. Additionally, fluctuating domestic and international demand, shifting demographics and often unpredictable changes in consumer tastes can drastically affect a telecommunication company’s profitability. While all companies may be susceptible to network security breaches, certain companies in the telecommunications sector may be particular targets of hacking and potential theft of proprietary or consumer information or disruptions in service, which could have a material adverse effect on their businesses.

 

YieldMax(R) ASTS Option Income Strategy ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. Derivatives are financial instruments that derive value from the underlying reference asset or assets, such as stocks, bonds, or funds (including ETFs), interest rates or indexes. The Fund’s investments in derivatives may pose risks in addition to, and greater than, those associated with directly investing in securities or other ordinary investments, including risk related to the market, imperfect correlation with underlying investments or the Fund’s other portfolio holdings, higher price volatility, lack of availability, counterparty risk, liquidity, valuation and legal restrictions. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The use of derivatives may result in larger losses or smaller gains than directly investing in securities. When the Fund uses derivatives, there may be an imperfect correlation between the value of the Underlying Security and the derivative, which may prevent the Fund from achieving its investment objective. Because derivatives often require only a limited initial investment, the use of derivatives may expose the Fund to losses in excess of those amounts initially invested. In addition, the Fund’s investments in derivatives are subject to the following risks:

 

YieldMax(R) ASTS Option Income Strategy ETF | Options Contracts [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Options Contracts. The use of options contracts involves investment strategies and risks different from those associated with ordinary portfolio securities transactions. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, including the anticipated volatility, which are affected by fiscal and monetary policies and by national and international political, changes in the actual or implied volatility or the reference asset, the time remaining until the expiration of the option contract and economic events. For the Fund in particular, the value of the options contracts in which it invests is substantially influenced by the value of the Underlying Security. The Fund may experience substantial downside from specific option positions and certain option positions held by the Fund may expire worthless. The options held by the Fund are exercisable at the strike price on their expiration date. As an option approaches its expiration date, its value typically increasingly moves with the value of the underlying instrument. However, prior to such date, the value of an option generally does not increase or decrease at the same rate at the underlying instrument. There may at times be an imperfect correlation between the movement in the values of options contracts and the underlying instrument, and there may at times not be a liquid secondary market for certain options contracts. The value of the options held by the Fund will be determined based on market quotations or other recognized pricing methods. Additionally, as the Fund intends to continuously maintain indirect exposure to the Underlying Security through the use of options contracts, as the options contracts it holds are exercised or expire it will enter into new options contracts, a practice referred to as “rolling.” If the expiring options contracts do not generate proceeds enough to cover the cost of entering into new options contracts, the Fund may experience losses.

 

YieldMax(R) ASTS Option Income Strategy ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. To the extent contemplated by its investment strategy, the Fund may use derivative instruments, such as options, swaps, futures contracts and other instruments, to obtain or manage investment exposure. Derivatives may be subject to counterparty risk, meaning the risk that a counterparty, clearing member or clearing house will be unwilling or unable to perform its obligations to the Fund due to bankruptcy, insolvency, financial distress, operational failure or other default. If a counterparty or clearing member defaults, the Fund may lose the expected benefit of the transaction, experience delays or costs in recovering collateral or other amounts owed to it, or be required to enter into replacement transactions on less favorable terms, if at all. The Fund also may be unable to implement its investment strategy effectively if suitable counterparties or clearing members are unavailable.

 

YieldMax(R) ASTS Option Income Strategy ETF | Price Participation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Price Participation Risk. The Fund employs an investment strategy that includes the sale of call option contracts, which limits the degree to which the Fund will participate in increases in value experienced by the Underlying Security over the Call Period. This means that if the Underlying Security experiences an increase in value above the strike price of the sold call options during a Call Period, the Fund will likely not experience that increase to the same extent and may significantly underperform the Underlying Security over the Call Period. Additionally, because the Fund is limited in the degree to which it will participate in increases in value experienced by the Underlying Security over each Call Period, but has full exposure to any decreases in value experienced by the Underlying Security over the Call Period, the NAV of the Fund may decrease over any given time period. The Fund’s NAV is dependent on the value of each options portfolio, which is based principally upon the performance of the Underlying Security. The degree of participation in the Underlying Security gains the Fund will experience will depend on prevailing market conditions, especially market volatility, at the time the Fund enters into the sold call option contracts and will vary from Call Period to Call Period. The value of the options contracts is affected by changes in the value and dividend rates of the Underlying Security, changes in interest rates, changes in the actual or perceived volatility of the Underlying Security and the remaining time to the options’ expiration, as well as trading conditions in the options market. As the price of the Underlying Security changes and time moves towards the expiration of each Call Period, the value of the options contracts, and therefore the Fund’s NAV, will change. However, it is not expected for the Fund’s NAV to directly correlate on a day-to-day basis with the returns of the Underlying Security. The amount of time remaining until the options contract’s expiration date affects the impact of the potential options premiums on the Fund’s NAV, which may not be in full effect until the expiration date of the Fund’s options contracts. Therefore, while changes in the price of the Underlying Security will result in changes to the Fund’s NAV, the Fund generally anticipates that the rate of change in the Fund’s NAV will be different than that experienced by the Underlying Security.

 

YieldMax(R) ASTS Option Income Strategy ETF | Distribution Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Distribution Risk. The Fund seeks to provide weekly cash distributions. There is no assurance that the Fund will make a distribution in any given week. If the Fund does make distributions, the amounts of such distributions will likely vary greatly from one distribution to the next. Additionally, the weekly distributions, if any, may consist of returns of capital, which would decrease the Fund’s NAV and trading price over time. As a result, an investor may suffer significant losses to their investment. In addition, while the underlying stock may pay dividends, the Fund’s returns will not include any dividends paid by the underlying stock, and any income generated by the Fund may be less than the income generated by a direct investment in the underlying stock.

 

YieldMax(R) ASTS Option Income Strategy ETF | NAV Decline Risk Due to Distributions [Member]  
Prospectus [Line Items]  
Risk [Text Block]

NAV Decline  Risk Due to Distributions. When the Fund makes a distribution, the Fund’s NAV will typically drop by the amount of the distribution on the related ex-dividend date. The repeated payment of distributions by the Fund, if any, may cause the Fund’s NAV and trading price to decline significantly over time. As a result, an investor may suffer significant losses to their investment.

 

YieldMax(R) ASTS Option Income Strategy ETF | Call Strategy Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Call Strategy Risks. The path dependency (i.e., the continued use) of the Fund’s call writing strategy will impact the extent that the Fund participates in the positive price returns of the Underlying Security and, in turn, the Fund’s returns, both during the term of the sold call options and over longer time periods. If, for example, each month the Fund were to sell 7% out-of-the-money call options having a one-month term, the Fund’s participation in the positive price returns of the Underlying Security will be capped at 7% in any given month. However, over a longer period (e.g., 5 months), the Fund should not be expected to participate fully in the first 35% (i.e., 5 months x 7%) of the positive price returns of the Underlying Security, or the Fund may even lose money, even if the Underlying Security share price has appreciated by at least that much over such period, if during any month over that period the Underlying Security had a return less than 7%. This example illustrates that both the Fund’s participation in the positive price returns of the Underlying Security and its returns will depend not only on the price of the Underlying Security but also on the path that the Underlying Security takes over time.

 

Additionally, when implementing the Covered Call Spread Strategy, the use of credit call spreads introduces further complexities and risks. While purchasing a higher-strike call option limits potential losses from the short call position, it also reduces the net premium received, which may result in lower overall returns compared to a stand-alone covered call strategy. If the price of the Underlying Security rises rapidly, the call spread may still cap upside participation, leading to missed profit opportunities. Furthermore, market conditions, such as mispricing between near-the-money and further out-of-the-money options, may impact the effectiveness of the strategy, potentially resulting in lower-than-expected returns or increased losses. The relative pricing of options at different strike levels can vary due to volatility shifts, liquidity constraints, or other market dynamics, adding an additional layer of uncertainty to the Fund’s performance under this strategy.

 

YieldMax(R) ASTS Option Income Strategy ETF | ETF Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks.

 

YieldMax(R) ASTS Option Income Strategy ETF | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that are authorized to purchase and redeem Shares directly from the Fund (known as “Authorized Participants” or “APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services; or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

YieldMax(R) ASTS Option Income Strategy ETF | Cash Redemption Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Cash Redemption Risk. The Fund’s investment strategy may require it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds. For example, the Fund may not be able to redeem in-kind certain securities held by the Fund (e.g., derivative instruments). In such a case, the Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. By paying out higher annual capital gain distributions, investors may be subjected to increased capital gains taxes. Additionally, there may be brokerage costs or taxable gains or losses that may be imposed on the Fund in connection with a cash redemption that may not have occurred if the Fund had made a redemption in-kind. These costs could decrease the value of the Fund to the extent they are not offset by a transaction fee payable by an AP.

 

YieldMax(R) ASTS Option Income Strategy ETF | Costs of Buying or Selling Shares [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Costs of Buying or Selling Shares. Buying or selling Shares involves certain costs, including brokerage commissions, other charges imposed by brokers, and bid-ask spreads. The bid-ask spread represents the difference between the price at which an investor is willing to buy Shares and the price at which an investor is willing to sell Shares. The spread varies over time based on the Shares’ trading volume and market liquidity. The spread is generally lower if Shares have more trading volume and market liquidity and higher if Shares have little trading volume and market liquidity. Due to the costs of buying or selling Shares, frequent trading of Shares may reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

 

YieldMax(R) ASTS Option Income Strategy ETF | Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Management Risk. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses that may not produce the desired result. There can be no guarantee that the Fund will meet its investment objective.

 

YieldMax(R) ASTS Option Income Strategy ETF | Shares May Trade at Prices Other Than NAV [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

 

YieldMax(R) ASTS Option Income Strategy ETF | Trading [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading. Although Shares are listed on a national securities exchange, such as The Nasdaq Stock Market, LLC (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market for the Shares will develop or be maintained or that the Shares will trade with any volume, or at all, on any stock exchange. This risk may be greater for the Fund as it seeks to have indirect exposure to a single underlying stock as opposed to a more diverse portfolio like a traditional pooled investment. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares. Shares trade on the Exchange at a market price that may be below, at or above the Fund’s NAV.

 

YieldMax(R) ASTS Option Income Strategy ETF | Trading Halt Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading Halt Risk. Trading in Shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Shares inadvisable. In addition, trading in Shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. In the event of an unscheduled market close for options contracts that reference a single stock, such as the Underlying Security’s securities being halted or a market wide closure, settlement prices will be determined by the procedures of the listing exchange of the options contracts. As a result, the Fund could be adversely affected and be unable to implement its investment strategies in the event of an unscheduled closing.

 

YieldMax(R) ASTS Option Income Strategy ETF | Economic and Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Economic and Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in the general financial markets, a particular financial market, or other asset classes, due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics. The imposition by the U.S. of tariffs on goods imported from foreign countries and reciprocal tariffs levied on U.S. goods by those countries also may lead to volatility and instability in domestic and foreign markets.

 

YieldMax(R) ASTS Option Income Strategy ETF | High Portfolio Turnover Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

High Portfolio Turnover Risk. The Fund may actively and frequently trade all or a significant portion of the Fund’s holdings. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.

 

YieldMax(R) ASTS Option Income Strategy ETF | Inflation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Inflation Risk. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the present value of the Fund’s assets and distributions, if any, may decline.

 

YieldMax(R) ASTS Option Income Strategy ETF | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Liquidity Risk. Some securities held by the Fund, including options contracts, may be difficult to sell or be illiquid, particularly during times of market turmoil. This risk is greater for the Fund as it will hold options contracts on a single security, and not a broader range of options contracts. Markets for securities or financial instruments could be disrupted by a number of events, including, but not limited to, an economic crisis, natural disasters, epidemics/pandemics, new legislation or regulatory changes inside or outside the United States. Illiquid securities may be difficult to value, especially in changing or volatile markets. If the Fund is forced to sell an illiquid security at an unfavorable time or price, the Fund may be adversely impacted. Certain market conditions or restrictions, such as market rules related to short sales, may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Underlying Security. There is no assurance that a security that is deemed liquid when purchased will continue to be liquid. Market illiquidity may cause losses for the Fund.

 

YieldMax(R) ASTS Option Income Strategy ETF | Money Market Instrument Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Money Market Instrument Risk. The Fund may use a variety of money market instruments for cash management purposes, including money market funds, depositary accounts and repurchase agreements. Repurchase agreements are contracts in which a seller of securities agrees to buy the securities back at a specified time and price. Repurchase agreements may be subject to market and credit risk related to the collateral securing the repurchase agreement. Money market instruments, including money market funds, may lose money through fees or other means.

 

YieldMax(R) ASTS Option Income Strategy ETF | Operational Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third-parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund, and Adviser seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks.

 

YieldMax(R) ASTS Option Income Strategy ETF | Single Issuer Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Single Issuer Risk. Issuer-specific attributes may cause an investment in the Fund to be more volatile than a traditional pooled investment which diversifies risk or the market generally. The value of the Fund, which focuses on an individual security (the Underlying Security), may be more volatile than a traditional pooled investment or the market as a whole and may perform differently from the value of a traditional pooled investment or the market as a whole.

 

YieldMax(R) ASTS Option Income Strategy ETF | Tax Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Tax Risk. The Fund intends to elect and to qualify each year to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (“Code”). As a RIC, the Fund will not be subject to U.S. federal income tax on the portion of its net investment income and net capital gain that it distributes to Shareholders, provided that it satisfies certain requirements of the Code. If the Fund does not qualify as a RIC for any taxable year and certain relief provisions are not available, the Fund’s taxable income will be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. To comply with the asset diversification test applicable to a RIC, the Fund will attempt to ensure that the value of options it holds is never 25% of the total value of Fund assets at the close of any quarter. If the Fund’s investments in options were to exceed 25% of the Fund’s total assets at the end of a tax quarter, the Fund, generally, has a grace period to cure such lack of compliance. If the Fund fails to timely cure, it may no longer be eligible to be treated as a RIC.

 

YieldMax(R) ASTS Option Income Strategy ETF | U.S. Government and U.S. Agency Obligations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

U.S. Government and U.S. Agency Obligations Risk. The Fund may invest in securities issued by the U.S. government or its agencies or instrumentalities. U.S. Government obligations include securities issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, such as the U.S. Treasury. Payment of principal and interest on U.S. Government obligations may be backed by the full faith and credit of the United States or may be backed solely by the issuing or guaranteeing agency or instrumentality itself. In the latter case, the investor must look principally to the agency or instrumentality issuing or guaranteeing the obligation for ultimate repayment, which agency or instrumentality may be privately owned. There can be no assurance that the U.S. Government would provide financial support to its agencies or instrumentalities (including government-sponsored enterprises) where it is not obligated to do so.

 

YieldMax(R) ASTS Option Income Strategy ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The Fund may not achieve its investment objective and there is a risk that you could lose all of your money invested in the Fund.
YieldMax(R) ASTS Option Income Strategy ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Non-Diversification Risk. Because the Fund is “non-diversified,” it may invest a greater percentage of its assets in the securities of a single issuer or a smaller number of issuers than if it was a diversified fund. As a result, a decline in the value of an investment in a single issuer or a smaller number of issuers could cause the Fund’s overall value to decline to a greater degree than if the Fund held a more diversified portfolio. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance.

 

YieldMax(R) RKLB Option Income Strategy ETF | Underlying Security Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Underlying Security Risks. The Fund invests in options that are based on the share price of RKLB. This subjects the Fund to certain of the same risks as if it owned shares of RKLB, even though it does not. By virtue of the Fund’s investments in options that are based on the value of RKLB, the Fund may also be subject to the following risks:

 

YieldMax(R) RKLB Option Income Strategy ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. Derivatives are financial instruments that derive value from the underlying reference asset or assets, such as stocks, bonds, or funds (including ETFs), interest rates or indexes. The Fund’s investments in derivatives may pose risks in addition to, and greater than, those associated with directly investing in securities or other ordinary investments, including risk related to the market, imperfect correlation with underlying investments or the Fund’s other portfolio holdings, higher price volatility, lack of availability, counterparty risk, liquidity, valuation and legal restrictions. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The use of derivatives may result in larger losses or smaller gains than directly investing in securities. When the Fund uses derivatives, there may be an imperfect correlation between the value of the Underlying Security and the derivative, which may prevent the Fund from achieving its investment objective. Because derivatives often require only a limited initial investment, the use of derivatives may expose the Fund to losses in excess of those amounts initially invested. In addition, the Fund’s investments in derivatives are subject to the following risks:

 

YieldMax(R) RKLB Option Income Strategy ETF | Options Contracts [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Options Contracts. The use of options contracts involves investment strategies and risks different from those associated with ordinary portfolio securities transactions. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, including the anticipated volatility, which are affected by fiscal and monetary policies and by national and international political, changes in the actual or implied volatility or the reference asset, the time remaining until the expiration of the option contract and economic events. For the Fund in particular, the value of the options contracts in which it invests is substantially influenced by the value of the Underlying Security. The Fund may experience substantial downside from specific option positions and certain option positions held by the Fund may expire worthless. The options held by the Fund are exercisable at the strike price on their expiration date. As an option approaches its expiration date, its value typically increasingly moves with the value of the underlying instrument. However, prior to such date, the value of an option generally does not increase or decrease at the same rate at the underlying instrument. There may at times be an imperfect correlation between the movement in the values of options contracts and the underlying instrument, and there may at times not be a liquid secondary market for certain options contracts. The value of the options held by the Fund will be determined based on market quotations or other recognized pricing methods. Additionally, as the Fund intends to continuously maintain indirect exposure to the Underlying Security through the use of options contracts, as the options contracts it holds are exercised or expire it will enter into new options contracts, a practice referred to as “rolling.” If the expiring options contracts do not generate proceeds enough to cover the cost of entering into new options contracts, the Fund may experience losses.

 

YieldMax(R) RKLB Option Income Strategy ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. To the extent contemplated by its investment strategy, the Fund may use derivative instruments, such as options, swaps, futures contracts and other instruments, to obtain or manage investment exposure. Derivatives may be subject to counterparty risk, meaning the risk that a counterparty, clearing member or clearing house will be unwilling or unable to perform its obligations to the Fund due to bankruptcy, insolvency, financial distress, operational failure or other default. If a counterparty or clearing member defaults, the Fund may lose the expected benefit of the transaction, experience delays or costs in recovering collateral or other amounts owed to it, or be required to enter into replacement transactions on less favorable terms, if at all. The Fund also may be unable to implement its investment strategy effectively if suitable counterparties or clearing members are unavailable.

 

YieldMax(R) RKLB Option Income Strategy ETF | Price Participation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Price Participation Risk. The Fund employs an investment strategy that includes the sale of call option contracts, which limits the degree to which the Fund will participate in increases in value experienced by the Underlying Security over the Call Period. This means that if the Underlying Security experiences an increase in value above the strike price of the sold call options during a Call Period, the Fund will likely not experience that increase to the same extent and may significantly underperform the Underlying Security over the Call Period. Additionally, because the Fund is limited in the degree to which it will participate in increases in value experienced by the Underlying Security over each Call Period, but has full exposure to any decreases in value experienced by the Underlying Security over the Call Period, the NAV of the Fund may decrease over any given time period. The Fund’s NAV is dependent on the value of each options portfolio, which is based principally upon the performance of the Underlying Security. The degree of participation in the Underlying Security gains the Fund will experience will depend on prevailing market conditions, especially market volatility, at the time the Fund enters into the sold call option contracts and will vary from Call Period to Call Period. The value of the options contracts is affected by changes in the value and dividend rates of the Underlying Security, changes in interest rates, changes in the actual or perceived volatility of the Underlying Security and the remaining time to the options’ expiration, as well as trading conditions in the options market. As the price of the Underlying Security changes and time moves towards the expiration of each Call Period, the value of the options contracts, and therefore the Fund’s NAV, will change. However, it is not expected for the Fund’s NAV to directly correlate on a day-to-day basis with the returns of the Underlying Security. The amount of time remaining until the options contract’s expiration date affects the impact of the potential options premiums on the Fund’s NAV, which may not be in full effect until the expiration date of the Fund’s options contracts. Therefore, while changes in the price of the Underlying Security will result in changes to the Fund’s NAV, the Fund generally anticipates that the rate of change in the Fund’s NAV will be different than that experienced by the Underlying Security.

 

YieldMax(R) RKLB Option Income Strategy ETF | Distribution Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Distribution Risk. The Fund seeks to provide weekly cash distributions. There is no assurance that the Fund will make a distribution in any given week. If the Fund does make distributions, the amounts of such distributions will likely vary greatly from one distribution to the next. Additionally, the weekly distributions, if any, may consist of returns of capital, which would decrease the Fund’s NAV and trading price over time. As a result, an investor may suffer significant losses to their investment. In addition, while the underlying stock may pay dividends, the Fund’s returns will not include any dividends paid by the underlying stock, and any income generated by the Fund may be less than the income generated by a direct investment in the underlying stock.

 

YieldMax(R) RKLB Option Income Strategy ETF | NAV Decline Risk Due to Distributions [Member]  
Prospectus [Line Items]  
Risk [Text Block]

NAV Decline  Risk Due to Distributions. When the Fund makes a distribution, the Fund’s NAV will typically drop by the amount of the distribution on the related ex-dividend date. The repeated payment of distributions by the Fund, if any, may cause the Fund’s NAV and trading price to decline significantly over time. As a result, an investor may suffer significant losses to their investment.

 

YieldMax(R) RKLB Option Income Strategy ETF | Call Strategy Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Call Strategy Risks. The path dependency (i.e., the continued use) of the Fund’s call writing strategy will impact the extent that the Fund participates in the positive price returns of the Underlying Security and, in turn, the Fund’s returns, both during the term of the sold call options and over longer time periods. If, for example, each month the Fund were to sell 7% out-of-the-money call options having a one-month term, the Fund’s participation in the positive price returns of the Underlying Security will be capped at 7% in any given month. However, over a longer period (e.g., 5 months), the Fund should not be expected to participate fully in the first 35% (i.e., 5 months x 7%) of the positive price returns of the Underlying Security, or the Fund may even lose money, even if the Underlying Security share price has appreciated by at least that much over such period, if during any month over that period the Underlying Security had a return less than 7%. This example illustrates that both the Fund’s participation in the positive price returns of the Underlying Security and its returns will depend not only on the price of the Underlying Security but also on the path that the Underlying Security takes over time.

 

Additionally, when implementing the Covered Call Spread Strategy, the use of credit call spreads introduces further complexities and risks. While purchasing a higher-strike call option limits potential losses from the short call position, it also reduces the net premium received, which may result in lower overall returns compared to a stand-alone covered call strategy. If the price of the Underlying Security rises rapidly, the call spread may still cap upside participation, leading to missed profit opportunities. Furthermore, market conditions, such as mispricing between near-the-money and further out-of-the-money options, may impact the effectiveness of the strategy, potentially resulting in lower-than-expected returns or increased losses. The relative pricing of options at different strike levels can vary due to volatility shifts, liquidity constraints, or other market dynamics, adding an additional layer of uncertainty to the Fund’s performance under this strategy.

 

YieldMax(R) RKLB Option Income Strategy ETF | ETF Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks.

 

YieldMax(R) RKLB Option Income Strategy ETF | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that are authorized to purchase and redeem Shares directly from the Fund (known as “Authorized Participants” or “APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services; or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

YieldMax(R) RKLB Option Income Strategy ETF | Cash Redemption Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Cash Redemption Risk. The Fund’s investment strategy may require it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds. For example, the Fund may not be able to redeem in-kind certain securities held by the Fund (e.g., derivative instruments). In such a case, the Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. By paying out higher annual capital gain distributions, investors may be subjected to increased capital gains taxes. Additionally, there may be brokerage costs or taxable gains or losses that may be imposed on the Fund in connection with a cash redemption that may not have occurred if the Fund had made a redemption in-kind. These costs could decrease the value of the Fund to the extent they are not offset by a transaction fee payable by an AP.

 

YieldMax(R) RKLB Option Income Strategy ETF | Costs of Buying or Selling Shares [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Costs of Buying or Selling Shares. Buying or selling Shares involves certain costs, including brokerage commissions, other charges imposed by brokers, and bid-ask spreads. The bid-ask spread represents the difference between the price at which an investor is willing to buy Shares and the price at which an investor is willing to sell Shares. The spread varies over time based on the Shares’ trading volume and market liquidity. The spread is generally lower if Shares have more trading volume and market liquidity and higher if Shares have little trading volume and market liquidity. Due to the costs of buying or selling Shares, frequent trading of Shares may reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

 

YieldMax(R) RKLB Option Income Strategy ETF | Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Management Risk. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses that may not produce the desired result. There can be no guarantee that the Fund will meet its investment objective.

 

YieldMax(R) RKLB Option Income Strategy ETF | Shares May Trade at Prices Other Than NAV [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

 

YieldMax(R) RKLB Option Income Strategy ETF | Trading [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading. Although Shares are listed on a national securities exchange, such as The Nasdaq Stock Market, LLC (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market for the Shares will develop or be maintained or that the Shares will trade with any volume, or at all, on any stock exchange. This risk may be greater for the Fund as it seeks to have indirect exposure to a single underlying stock as opposed to a more diverse portfolio like a traditional pooled investment. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares. Shares trade on the Exchange at a market price that may be below, at or above the Fund’s NAV.

 

YieldMax(R) RKLB Option Income Strategy ETF | Trading Halt Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading Halt Risk. Trading in Shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Shares inadvisable. In addition, trading in Shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. In the event of an unscheduled market close for options contracts that reference a single stock, such as the Underlying Security’s securities being halted or a market wide closure, settlement prices will be determined by the procedures of the listing exchange of the options contracts. As a result, the Fund could be adversely affected and be unable to implement its investment strategies in the event of an unscheduled closing.

 

YieldMax(R) RKLB Option Income Strategy ETF | Economic and Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Economic and Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in the general financial markets, a particular financial market, or other asset classes, due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics. The imposition by the U.S. of tariffs on goods imported from foreign countries and reciprocal tariffs levied on U.S. goods by those countries also may lead to volatility and instability in domestic and foreign markets.

 

YieldMax(R) RKLB Option Income Strategy ETF | High Portfolio Turnover Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

High Portfolio Turnover Risk. The Fund may actively and frequently trade all or a significant portion of the Fund’s holdings. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.

 

YieldMax(R) RKLB Option Income Strategy ETF | Inflation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Inflation Risk. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the present value of the Fund’s assets and distributions, if any, may decline.

 

YieldMax(R) RKLB Option Income Strategy ETF | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Liquidity Risk. Some securities held by the Fund, including options contracts, may be difficult to sell or be illiquid, particularly during times of market turmoil. This risk is greater for the Fund as it will hold options contracts on a single security, and not a broader range of options contracts. Markets for securities or financial instruments could be disrupted by a number of events, including, but not limited to, an economic crisis, natural disasters, epidemics/pandemics, new legislation or regulatory changes inside or outside the United States. Illiquid securities may be difficult to value, especially in changing or volatile markets. If the Fund is forced to sell an illiquid security at an unfavorable time or price, the Fund may be adversely impacted. Certain market conditions or restrictions, such as market rules related to short sales, may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Underlying Security. There is no assurance that a security that is deemed liquid when purchased will continue to be liquid. Market illiquidity may cause losses for the Fund.

 

YieldMax(R) RKLB Option Income Strategy ETF | Money Market Instrument Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Money Market Instrument Risk. The Fund may use a variety of money market instruments for cash management purposes, including money market funds, depositary accounts and repurchase agreements. Repurchase agreements are contracts in which a seller of securities agrees to buy the securities back at a specified time and price. Repurchase agreements may be subject to market and credit risk related to the collateral securing the repurchase agreement. Money market instruments, including money market funds, may lose money through fees or other means.

 

YieldMax(R) RKLB Option Income Strategy ETF | Operational Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third-parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund, and Adviser seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks.

 

YieldMax(R) RKLB Option Income Strategy ETF | Single Issuer Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Single Issuer Risk. Issuer-specific attributes may cause an investment in the Fund to be more volatile than a traditional pooled investment which diversifies risk or the market generally. The value of the Fund, which focuses on an individual security (the Underlying Security), may be more volatile than a traditional pooled investment or the market as a whole and may perform differently from the value of a traditional pooled investment or the market as a whole.

 

YieldMax(R) RKLB Option Income Strategy ETF | Tax Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Tax Risk. The Fund intends to elect and to qualify each year to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (“Code”). As a RIC, the Fund will not be subject to U.S. federal income tax on the portion of its net investment income and net capital gain that it distributes to Shareholders, provided that it satisfies certain requirements of the Code. If the Fund does not qualify as a RIC for any taxable year and certain relief provisions are not available, the Fund’s taxable income will be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. To comply with the asset diversification test applicable to a RIC, the Fund will attempt to ensure that the value of options it holds is never 25% of the total value of Fund assets at the close of any quarter. If the Fund’s investments in options were to exceed 25% of the Fund’s total assets at the end of a tax quarter, the Fund, generally, has a grace period to cure such lack of compliance. If the Fund fails to timely cure, it may no longer be eligible to be treated as a RIC.

 

YieldMax(R) RKLB Option Income Strategy ETF | U.S. Government and U.S. Agency Obligations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

U.S. Government and U.S. Agency Obligations Risk. The Fund may invest in securities issued by the U.S. government or its agencies or instrumentalities. U.S. Government obligations include securities issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, such as the U.S. Treasury. Payment of principal and interest on U.S. Government obligations may be backed by the full faith and credit of the United States or may be backed solely by the issuing or guaranteeing agency or instrumentality itself. In the latter case, the investor must look principally to the agency or instrumentality issuing or guaranteeing the obligation for ultimate repayment, which agency or instrumentality may be privately owned. There can be no assurance that the U.S. Government would provide financial support to its agencies or instrumentalities (including government-sponsored enterprises) where it is not obligated to do so.

 

YieldMax(R) RKLB Option Income Strategy ETF | Indirect Investment in RKLB Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Indirect Investment in RKLB Risk. RKLB is not affiliated with the Trust, the Fund, or the Adviser, or their respective affiliates and is not involved with this offering in any way and has no obligation to consider your Shares in taking any corporate actions that might affect the value of Shares. Investors in the Fund will not have voting rights and will not be able to influence management of RKLB but will be exposed to the performance of RKLB (the Underlying Security). Investors in the Fund will not have the right to receive dividends or other distributions or any other rights with respect to the Underlying Security but will be subject to declines in the performance of the Underlying Security.

 

YieldMax(R) RKLB Option Income Strategy ETF | RKLB Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
RKLB Trading Risk. The trading price of RKLB may be subject to volatility and could experience wide fluctuations due to various factors. Short sellers may also play a significant role in trading RKLB, potentially affecting the supply and demand dynamics and contributing to market price volatility. Public perception and external factors beyond the company’s control may influence RKLB’s stock price disproportionately. Additionally, following periods of market volatility, companies have faced securities class action litigation. Any adverse judgment or future stockholder litigation could result in substantial costs and divert management’s attention and resources. In the event of a halt in trading of RKLB, trading in shares of related funds may be impacted, either temporarily or indefinitely.

 

YieldMax(R) RKLB Option Income Strategy ETF | RKLB Performance Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
RKLB Performance Risk. RKLB may fail to meet its publicly announced guidelines or other expectations about its business, which could cause the price of RKLB to decline. RKLB provides guidance regarding its expected financial and business performance, such as projections regarding sales and production. Correctly identifying key factors affecting business conditions and predicting future events is inherently an uncertain process, and the guidance RKLB provides may not ultimately be accurate. If RKLB’s guidance is not accurate or varies from actual results due to its inability to meet the assumptions or the impact on its financial performance that could occur as a result of various risks and uncertainties, the market value of common stock issued by RKLB could decline significantly.

 

YieldMax(R) RKLB Option Income Strategy ETF | Aerospace & Defense Industry Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Aerospace & Defense Industry Risks. Companies in the aerospace and defense industry are subject to risks stemming from their reliance on government budgets and spending priorities, which can fluctuate due to political and economic pressures. These companies often operate in highly competitive markets and may face challenges from both domestic and international competitors. The aerospace and defense industry is also affected by geopolitical tensions, trade policies, and regulatory changes that can impact market access and operational efficiency. Aerospace and defense companies typically rely on complex supply chains for specialized components and materials. Disruptions in these supply chains, whether due to shortages, price increases, or geopolitical factors, can significantly affect production and profitability. Additionally, technological advancements are critical for maintaining competitiveness in this sector, but the high cost and uncertain outcomes of research and development efforts may pose financial risks. Companies in this industry face heightened cybersecurity risks due to the sensitive nature of their technologies, and breaches can lead to operational disruptions, reputational damage, and regulatory scrutiny. Long-term fixed-cost contracts, which are common in this sector, may expose companies to financial losses if costs exceed estimates. Furthermore, environmental and safety regulations, as well as export controls, tariffs, and trade restrictions, impose significant compliance costs and may limit market opportunities. The aerospace and defense industry is inherently cyclical and influenced by global political and economic developments, which can contribute to earnings volatility and investment risks.

 

YieldMax(R) RKLB Option Income Strategy ETF | RKLB Business Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
RKLB Business Risks. RKLB has experienced rapid growth, with its employee base and operations expanding substantially in recent years, placing considerable demands on its management, operational infrastructure, and financial resources. Continued growth is dependent on RKLB’s ability to scale its revenue, improve operational efficiencies, and maintain profitability while effectively managing its increasingly complex organizational structure. Failure to integrate acquisitions, enhance business processes, or address evolving customer and market demands could adversely affect RKLB’s growth prospects. RKLB operates in competitive markets for rocket launch services, mission services, spacecraft, and spacecraft components, facing challenges from established players and new entrants. RKLB’s success relies on its ability to anticipate and respond to macroeconomic and industry-specific changes, hire and retain talent, and maintain high levels of customer satisfaction. Additionally, interruptions from information technology failures, cybersecurity breaches, or other infrastructure issues could disrupt operations. RKLB’s ability to comply with applicable regulations and adapt to changes in the industry also presents ongoing risks. While RKLB has demonstrated significant revenue growth in recent years, future revenue generation and growth are uncertain. Rising operating expenses may outpace revenue growth, potentially harming profitability and the company’s overall financial condition. Failure to address these risks could materially impact RKLB’s business and long-term prospects.

 

YieldMax(R) RKLB Option Income Strategy ETF | Intellectual Property and Cyber Security Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Intellectual Property and Cyber Security Risk. Any significant disruption in or unauthorized access to RKLB’s computer systems or those of third parties that RKLB utilizes in its operations, including those relating to cybersecurity or arising from cyber-attacks, could result in a loss or degradation of service, unauthorized disclosure of data, or theft or tampering of intellectual property, any of which could materially adversely impact RKLB’s business. 

 

YieldMax(R) RKLB Option Income Strategy ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The Fund may not achieve its investment objective and there is a risk that you could lose all of your money invested in the Fund.
YieldMax(R) RKLB Option Income Strategy ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Non-Diversification Risk. Because the Fund is “non-diversified,” it may invest a greater percentage of its assets in the securities of a single issuer or a smaller number of issuers than if it was a diversified fund. As a result, a decline in the value of an investment in a single issuer or a smaller number of issuers could cause the Fund’s overall value to decline to a greater degree than if the Fund held a more diversified portfolio. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance.

 

YieldMax(R) MU Option Income Strategy ETF | Underlying Security Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Underlying Security Risks. The Fund invests in options that are based on the share price of MU. This subjects the Fund to certain of the same risks as if it owned shares of MU, even though it does not. By virtue of the Fund’s investments in options that are based on the value of MU, the Fund may also be subject to the following risks:

 

YieldMax(R) MU Option Income Strategy ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. Derivatives are financial instruments that derive value from the underlying reference asset or assets, such as stocks, bonds, or funds (including ETFs), interest rates or indexes. The Fund’s investments in derivatives may pose risks in addition to, and greater than, those associated with directly investing in securities or other ordinary investments, including risk related to the market, imperfect correlation with underlying investments or the Fund’s other portfolio holdings, higher price volatility, lack of availability, counterparty risk, liquidity, valuation and legal restrictions. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The use of derivatives may result in larger losses or smaller gains than directly investing in securities. When the Fund uses derivatives, there may be an imperfect correlation between the value of the Underlying Security and the derivative, which may prevent the Fund from achieving its investment objective. Because derivatives often require only a limited initial investment, the use of derivatives may expose the Fund to losses in excess of those amounts initially invested. In addition, the Fund’s investments in derivatives are subject to the following risks:

 

YieldMax(R) MU Option Income Strategy ETF | Options Contracts [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Options Contracts. The use of options contracts involves investment strategies and risks different from those associated with ordinary portfolio securities transactions. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, including the anticipated volatility, which are affected by fiscal and monetary policies and by national and international political, changes in the actual or implied volatility or the reference asset, the time remaining until the expiration of the option contract and economic events. For the Fund in particular, the value of the options contracts in which it invests is substantially influenced by the value of the Underlying Security. The Fund may experience substantial downside from specific option positions and certain option positions held by the Fund may expire worthless. The options held by the Fund are exercisable at the strike price on their expiration date. As an option approaches its expiration date, its value typically increasingly moves with the value of the underlying instrument. However, prior to such date, the value of an option generally does not increase or decrease at the same rate at the underlying instrument. There may at times be an imperfect correlation between the movement in the values of options contracts and the underlying instrument, and there may at times not be a liquid secondary market for certain options contracts. The value of the options held by the Fund will be determined based on market quotations or other recognized pricing methods. Additionally, as the Fund intends to continuously maintain indirect exposure to the Underlying Security through the use of options contracts, as the options contracts it holds are exercised or expire it will enter into new options contracts, a practice referred to as “rolling.” If the expiring options contracts do not generate proceeds enough to cover the cost of entering into new options contracts, the Fund may experience losses.

 

YieldMax(R) MU Option Income Strategy ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. To the extent contemplated by its investment strategy, the Fund may use derivative instruments, such as options, swaps, futures contracts and other instruments, to obtain or manage investment exposure. Derivatives may be subject to counterparty risk, meaning the risk that a counterparty, clearing member or clearing house will be unwilling or unable to perform its obligations to the Fund due to bankruptcy, insolvency, financial distress, operational failure or other default. If a counterparty or clearing member defaults, the Fund may lose the expected benefit of the transaction, experience delays or costs in recovering collateral or other amounts owed to it, or be required to enter into replacement transactions on less favorable terms, if at all. The Fund also may be unable to implement its investment strategy effectively if suitable counterparties or clearing members are unavailable.

 

YieldMax(R) MU Option Income Strategy ETF | Price Participation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Price Participation Risk. The Fund employs an investment strategy that includes the sale of call option contracts, which limits the degree to which the Fund will participate in increases in value experienced by the Underlying Security over the Call Period. This means that if the Underlying Security experiences an increase in value above the strike price of the sold call options during a Call Period, the Fund will likely not experience that increase to the same extent and may significantly underperform the Underlying Security over the Call Period. Additionally, because the Fund is limited in the degree to which it will participate in increases in value experienced by the Underlying Security over each Call Period, but has full exposure to any decreases in value experienced by the Underlying Security over the Call Period, the NAV of the Fund may decrease over any given time period. The Fund’s NAV is dependent on the value of each options portfolio, which is based principally upon the performance of the Underlying Security. The degree of participation in the Underlying Security gains the Fund will experience will depend on prevailing market conditions, especially market volatility, at the time the Fund enters into the sold call option contracts and will vary from Call Period to Call Period. The value of the options contracts is affected by changes in the value and dividend rates of the Underlying Security, changes in interest rates, changes in the actual or perceived volatility of the Underlying Security and the remaining time to the options’ expiration, as well as trading conditions in the options market. As the price of the Underlying Security changes and time moves towards the expiration of each Call Period, the value of the options contracts, and therefore the Fund’s NAV, will change. However, it is not expected for the Fund’s NAV to directly correlate on a day-to-day basis with the returns of the Underlying Security. The amount of time remaining until the options contract’s expiration date affects the impact of the potential options premiums on the Fund’s NAV, which may not be in full effect until the expiration date of the Fund’s options contracts. Therefore, while changes in the price of the Underlying Security will result in changes to the Fund’s NAV, the Fund generally anticipates that the rate of change in the Fund’s NAV will be different than that experienced by the Underlying Security.

 

YieldMax(R) MU Option Income Strategy ETF | Distribution Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Distribution Risk. The Fund seeks to provide weekly cash distributions. There is no assurance that the Fund will make a distribution in any given week. If the Fund does make distributions, the amounts of such distributions will likely vary greatly from one distribution to the next. Additionally, the weekly distributions, if any, may consist of returns of capital, which would decrease the Fund’s NAV and trading price over time. As a result, an investor may suffer significant losses to their investment. In addition, while the underlying stock may pay dividends, the Fund’s returns will not include any dividends paid by the underlying stock, and any income generated by the Fund may be less than the income generated by a direct investment in the underlying stock.

 

YieldMax(R) MU Option Income Strategy ETF | NAV Decline Risk Due to Distributions [Member]  
Prospectus [Line Items]  
Risk [Text Block]

NAV Decline  Risk Due to Distributions. When the Fund makes a distribution, the Fund’s NAV will typically drop by the amount of the distribution on the related ex-dividend date. The repeated payment of distributions by the Fund, if any, may cause the Fund’s NAV and trading price to decline significantly over time. As a result, an investor may suffer significant losses to their investment.

 

YieldMax(R) MU Option Income Strategy ETF | Call Strategy Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Call Strategy Risks. The path dependency (i.e., the continued use) of the Fund’s call writing strategy will impact the extent that the Fund participates in the positive price returns of the Underlying Security and, in turn, the Fund’s returns, both during the term of the sold call options and over longer time periods. If, for example, each month the Fund were to sell 7% out-of-the-money call options having a one-month term, the Fund’s participation in the positive price returns of the Underlying Security will be capped at 7% in any given month. However, over a longer period (e.g., 5 months), the Fund should not be expected to participate fully in the first 35% (i.e., 5 months x 7%) of the positive price returns of the Underlying Security, or the Fund may even lose money, even if the Underlying Security share price has appreciated by at least that much over such period, if during any month over that period the Underlying Security had a return less than 7%. This example illustrates that both the Fund’s participation in the positive price returns of the Underlying Security and its returns will depend not only on the price of the Underlying Security but also on the path that the Underlying Security takes over time.

 

Additionally, when implementing the Covered Call Spread Strategy, the use of credit call spreads introduces further complexities and risks. While purchasing a higher-strike call option limits potential losses from the short call position, it also reduces the net premium received, which may result in lower overall returns compared to a stand-alone covered call strategy. If the price of the Underlying Security rises rapidly, the call spread may still cap upside participation, leading to missed profit opportunities. Furthermore, market conditions, such as mispricing between near-the-money and further out-of-the-money options, may impact the effectiveness of the strategy, potentially resulting in lower-than-expected returns or increased losses. The relative pricing of options at different strike levels can vary due to volatility shifts, liquidity constraints, or other market dynamics, adding an additional layer of uncertainty to the Fund’s performance under this strategy.

 

YieldMax(R) MU Option Income Strategy ETF | ETF Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks.

 

YieldMax(R) MU Option Income Strategy ETF | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that are authorized to purchase and redeem Shares directly from the Fund (known as “Authorized Participants” or “APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services; or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

YieldMax(R) MU Option Income Strategy ETF | Cash Redemption Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Cash Redemption Risk. The Fund’s investment strategy may require it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds. For example, the Fund may not be able to redeem in-kind certain securities held by the Fund (e.g., derivative instruments). In such a case, the Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. By paying out higher annual capital gain distributions, investors may be subjected to increased capital gains taxes. Additionally, there may be brokerage costs or taxable gains or losses that may be imposed on the Fund in connection with a cash redemption that may not have occurred if the Fund had made a redemption in-kind. These costs could decrease the value of the Fund to the extent they are not offset by a transaction fee payable by an AP.

 

YieldMax(R) MU Option Income Strategy ETF | Costs of Buying or Selling Shares [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Costs of Buying or Selling Shares. Buying or selling Shares involves certain costs, including brokerage commissions, other charges imposed by brokers, and bid-ask spreads. The bid-ask spread represents the difference between the price at which an investor is willing to buy Shares and the price at which an investor is willing to sell Shares. The spread varies over time based on the Shares’ trading volume and market liquidity. The spread is generally lower if Shares have more trading volume and market liquidity and higher if Shares have little trading volume and market liquidity. Due to the costs of buying or selling Shares, frequent trading of Shares may reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

 

YieldMax(R) MU Option Income Strategy ETF | Management Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Management Risk. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses that may not produce the desired result. There can be no guarantee that the Fund will meet its investment objective.

 

YieldMax(R) MU Option Income Strategy ETF | Shares May Trade at Prices Other Than NAV [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

 

YieldMax(R) MU Option Income Strategy ETF | Trading [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading. Although Shares are listed on a national securities exchange, such as The Nasdaq Stock Market, LLC (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market for the Shares will develop or be maintained or that the Shares will trade with any volume, or at all, on any stock exchange. This risk may be greater for the Fund as it seeks to have indirect exposure to a single underlying stock as opposed to a more diverse portfolio like a traditional pooled investment. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares. Shares trade on the Exchange at a market price that may be below, at or above the Fund’s NAV.

 

YieldMax(R) MU Option Income Strategy ETF | Trading Halt Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Trading Halt Risk. Trading in Shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Shares inadvisable. In addition, trading in Shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. In the event of an unscheduled market close for options contracts that reference a single stock, such as the Underlying Security’s securities being halted or a market wide closure, settlement prices will be determined by the procedures of the listing exchange of the options contracts. As a result, the Fund could be adversely affected and be unable to implement its investment strategies in the event of an unscheduled closing.

 

YieldMax(R) MU Option Income Strategy ETF | Economic and Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Economic and Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in the general financial markets, a particular financial market, or other asset classes, due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics. The imposition by the U.S. of tariffs on goods imported from foreign countries and reciprocal tariffs levied on U.S. goods by those countries also may lead to volatility and instability in domestic and foreign markets.

 

YieldMax(R) MU Option Income Strategy ETF | High Portfolio Turnover Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

High Portfolio Turnover Risk. The Fund may actively and frequently trade all or a significant portion of the Fund’s holdings. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.

 

YieldMax(R) MU Option Income Strategy ETF | Inflation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Inflation Risk. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the present value of the Fund’s assets and distributions, if any, may decline.

 

YieldMax(R) MU Option Income Strategy ETF | Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Liquidity Risk. Some securities held by the Fund, including options contracts, may be difficult to sell or be illiquid, particularly during times of market turmoil. This risk is greater for the Fund as it will hold options contracts on a single security, and not a broader range of options contracts. Markets for securities or financial instruments could be disrupted by a number of events, including, but not limited to, an economic crisis, natural disasters, epidemics/pandemics, new legislation or regulatory changes inside or outside the United States. Illiquid securities may be difficult to value, especially in changing or volatile markets. If the Fund is forced to sell an illiquid security at an unfavorable time or price, the Fund may be adversely impacted. Certain market conditions or restrictions, such as market rules related to short sales, may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Underlying Security. There is no assurance that a security that is deemed liquid when purchased will continue to be liquid. Market illiquidity may cause losses for the Fund.

 

YieldMax(R) MU Option Income Strategy ETF | Money Market Instrument Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Money Market Instrument Risk. The Fund may use a variety of money market instruments for cash management purposes, including money market funds, depositary accounts and repurchase agreements. Repurchase agreements are contracts in which a seller of securities agrees to buy the securities back at a specified time and price. Repurchase agreements may be subject to market and credit risk related to the collateral securing the repurchase agreement. Money market instruments, including money market funds, may lose money through fees or other means.

 

YieldMax(R) MU Option Income Strategy ETF | Operational Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third-parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund, and Adviser seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks.

 

YieldMax(R) MU Option Income Strategy ETF | Single Issuer Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Single Issuer Risk. Issuer-specific attributes may cause an investment in the Fund to be more volatile than a traditional pooled investment which diversifies risk or the market generally. The value of the Fund, which focuses on an individual security (the Underlying Security), may be more volatile than a traditional pooled investment or the market as a whole and may perform differently from the value of a traditional pooled investment or the market as a whole.

 

YieldMax(R) MU Option Income Strategy ETF | Tax Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Tax Risk. The Fund intends to elect and to qualify each year to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (“Code”). As a RIC, the Fund will not be subject to U.S. federal income tax on the portion of its net investment income and net capital gain that it distributes to Shareholders, provided that it satisfies certain requirements of the Code. If the Fund does not qualify as a RIC for any taxable year and certain relief provisions are not available, the Fund’s taxable income will be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. To comply with the asset diversification test applicable to a RIC, the Fund will attempt to ensure that the value of options it holds is never 25% of the total value of Fund assets at the close of any quarter. If the Fund’s investments in options were to exceed 25% of the Fund’s total assets at the end of a tax quarter, the Fund, generally, has a grace period to cure such lack of compliance. If the Fund fails to timely cure, it may no longer be eligible to be treated as a RIC.

 

YieldMax(R) MU Option Income Strategy ETF | U.S. Government and U.S. Agency Obligations Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

U.S. Government and U.S. Agency Obligations Risk. The Fund may invest in securities issued by the U.S. government or its agencies or instrumentalities. U.S. Government obligations include securities issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, such as the U.S. Treasury. Payment of principal and interest on U.S. Government obligations may be backed by the full faith and credit of the United States or may be backed solely by the issuing or guaranteeing agency or instrumentality itself. In the latter case, the investor must look principally to the agency or instrumentality issuing or guaranteeing the obligation for ultimate repayment, which agency or instrumentality may be privately owned. There can be no assurance that the U.S. Government would provide financial support to its agencies or instrumentalities (including government-sponsored enterprises) where it is not obligated to do so.

 

YieldMax(R) MU Option Income Strategy ETF | Indirect Investment in MU Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Indirect Investment in MU Risk. MU is not affiliated with the Trust, the Fund, or the Adviser, or their respective affiliates and is not involved with this offering in any way and has no obligation to consider your Shares in taking any corporate actions that might affect the value of Shares. Investors in the Fund will not have voting rights or influence over the management of MU but will be exposed to the performance of MU (the Underlying Security). Investors will also not have the right to receive dividends or other distributions from MU, but will remain subject to price fluctuations and other risks associated with ownership of the Underlying Security.

 

YieldMax(R) MU Option Income Strategy ETF | MU Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
MU Trading Risk. The trading price of MU may be subject to volatility and could experience wide fluctuations due to various factors. Short sellers may also influence MU’s trading activity, contributing to market instability. Public perception and external factors beyond the company’s control may influence MU’s stock price disproportionately. Additionally, following periods of market volatility, companies have faced securities class action litigation. Any adverse judgment or future stockholder litigation could result in substantial costs and divert management’s attention and resources. In the event of a trading halt, delisting, or significant disruption in the market for MU’s shares, the Fund may experience difficulty entering, modifying, or liquidating its exposures. These conditions could impair the Fund’s ability to achieve its investment objective, result in significant tracking error, or, in extreme cases, force the Fund to liquidate entirely.

 

YieldMax(R) MU Option Income Strategy ETF | MU Performance Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
MU Performance Risk. MU may fail to meet its publicly announced guidelines or other expectations about its business, which could cause the price of MU to decline. Correctly identifying key factors affecting business conditions and predicting future events is inherently an uncertain process, and the guidance MU provides may not ultimately be accurate. If MU’s guidance is not accurate or varies from actual results due to its inability to meet the assumptions or the impact on its financial performance that could occur as a result of various risks and uncertainties, the market value of common stock issued by MU could decline significantly.

 

YieldMax(R) MU Option Income Strategy ETF | MU Investing Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
MU Investing Risk. MU faces risks unique to its operations including, among others, cyclical fluctuations in demand and pricing for memory and storage products, supply and manufacturing disruptions, increased material or labor costs or shortages, rapid technological change, customer concentration, geopolitical and trade-related restrictions, and the ability to attract, hire and retain key employees or qualified personnel. The trading price of MU’s common stock historically has been and is likely to continue to be volatile. Additionally, the semiconductor industry is highly cyclical and subject to significant pricing pressure, changes in customer demand, and substantial capital investment requirements, all of which may materially affect MU’s financial performance. MU is a highly dynamic company, and its operations, including its products and services, may change.

 

YieldMax(R) MU Option Income Strategy ETF | Semiconductors & Semiconductor Equipment Industry Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
Semiconductors & Semiconductor Equipment Industry Risks. Competitive pressures may have a significant effect on the financial condition of semiconductor companies and, as product cycles shorten and manufacturing capacity increases, these companies may become increasingly subject to aggressive pricing, which hampers profitability. Reduced demand for end-user products, under-utilization of manufacturing capacity, and other factors could adversely impact the operating results of companies in the semiconductor industry. Semiconductor companies typically face high capital costs and may be heavily dependent on intellectual property rights. The semiconductor industry is highly cyclical, which may cause the operating results of many semiconductor companies to vary significantly. The industry is complex and global in nature, with manufacturing plants predominantly located in East Asia. Because of this, it is subject to numerous risks, including geopolitical tensions, earthquakes, and extreme weather events. The stock prices of companies in the semiconductor industry have been and likely will continue to be extremely volatile.

 

YieldMax(R) MU Option Income Strategy ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
YieldMax(R) MU Option Income Strategy ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Non-Diversification Risk. Because the Fund is “non-diversified,” it may invest a greater percentage of its assets in the securities of a single issuer or a smaller number of issuers than if it was a diversified fund. As a result, a decline in the value of an investment in a single issuer or a smaller number of issuers could cause the Fund’s overall value to decline to a greater degree than if the Fund held a more diversified portfolio. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance.

 

YieldMax(R) SNDK Option Income Strategy ETF | Underlying Security Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Underlying Security Risks. The Fund invests in options that are based on the share price of SNDK. This subjects the Fund to certain of the same risks as if it owned shares of SNDK, even though it does not. By virtue of the Fund’s investments in options that are based on the value of SNDK, the Fund may also be subject to the following risks:

 

YieldMax(R) SNDK Option Income Strategy ETF | Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. Derivatives are financial instruments that derive value from the underlying reference asset or assets, such as stocks, bonds, or funds (including ETFs), interest rates or indexes. The Fund’s investments in derivatives may pose risks in addition to, and greater than, those associated with directly investing in securities or other ordinary investments, including risk related to the market, imperfect correlation with underlying investments or the Fund’s other portfolio holdings, higher price volatility, lack of availability, counterparty risk, liquidity, valuation and legal restrictions. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The use of derivatives may result in larger losses or smaller gains than directly investing in securities. When the Fund uses derivatives, there may be an imperfect correlation between the value of the Underlying Security and the derivative, which may prevent the Fund from achieving its investment objective. Because derivatives often require only a limited initial investment, the use of derivatives may expose the Fund to losses in excess of those amounts initially invested. In addition, the Fund’s investments in derivatives are subject to the following risks:

 

YieldMax(R) SNDK Option Income Strategy ETF | Options Contracts [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Options Contracts. The use of options contracts involves investment strategies and risks different from those associated with ordinary portfolio securities transactions. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, including the anticipated volatility, which are affected by fiscal and monetary policies and by national and international political, changes in the actual or implied volatility or the reference asset, the time remaining until the expiration of the option contract and economic events. For the Fund in particular, the value of the options contracts in which it invests is substantially influenced by the value of the Underlying Security. The Fund may experience substantial downside from specific option positions and certain option positions held by the Fund may expire worthless. The options held by the Fund are exercisable at the strike price on their expiration date. As an option approaches its expiration date, its value typically increasingly moves with the value of the underlying instrument. However, prior to such date, the value of an option generally does not increase or decrease at the same rate at the underlying instrument. There may at times be an imperfect correlation between the movement in the values of options contracts and the underlying instrument, and there may at times not be a liquid secondary market for certain options contracts. The value of the options held by the Fund will be determined based on market quotations or other recognized pricing methods. Additionally, as the Fund intends to continuously maintain indirect exposure to the Underlying Security through the use of options contracts, as the options contracts it holds are exercised or expire it will enter into new options contracts, a practice referred to as “rolling.” If the expiring options contracts do not generate proceeds enough to cover the cost of entering into new options contracts, the Fund may experience losses.

 

YieldMax(R) SNDK Option Income Strategy ETF | Counterparty Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. To the extent contemplated by its investment strategy, the Fund may use derivative instruments, such as options, swaps, futures contracts and other instruments, to obtain or manage investment exposure. Derivatives may be subject to counterparty risk, meaning the risk that a counterparty, clearing member or clearing house will be unwilling or unable to perform its obligations to the Fund due to bankruptcy, insolvency, financial distress, operational failure or other default. If a counterparty or clearing member defaults, the Fund may lose the expected benefit of the transaction, experience delays or costs in recovering collateral or other amounts owed to it, or be required to enter into replacement transactions on less favorable terms, if at all. The Fund also may be unable to implement its investment strategy effectively if suitable counterparties or clearing members are unavailable.

 

YieldMax(R) SNDK Option Income Strategy ETF | Price Participation Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Price Participation Risk. The Fund employs an investment strategy that includes the sale of call option contracts, which limits the degree to which the Fund will participate in increases in value experienced by the Underlying Security over the Call Period. This means that if the Underlying Security experiences an increase in value above the strike price of the sold call options during a Call Period, the Fund will likely not experience that increase to the same extent and may significantly underperform the Underlying Security over the Call Period. Additionally, because the Fund is limited in the degree to which it will participate in increases in value experienced by the Underlying Security over each Call Period, but has full exposure to any decreases in value experienced by the Underlying Security over the Call Period, the NAV of the Fund may decrease over any given time period. The Fund’s NAV is dependent on the value of each options portfolio, which is based principally upon the performance of the Underlying Security. The degree of participation in the Underlying Security gains the Fund will experience will depend on prevailing market conditions, especially market volatility, at the time the Fund enters into the sold call option contracts and will vary from Call Period to Call Period. The value of the options contracts is affected by changes in the value and dividend rates of the Underlying Security, changes in interest rates, changes in the actual or perceived volatility of the Underlying Security and the remaining time to the options’ expiration, as well as trading conditions in the options market. As the price of the Underlying Security changes and time moves towards the expiration of each Call Period, the value of the options contracts, and therefore the Fund’s NAV, will change. However, it is not expected for the Fund’s NAV to directly correlate on a day-to-day basis with the returns of the Underlying Security. The amount of time remaining until the options contract’s expiration date affects the impact of the potential options premiums on the Fund’s NAV, which may not be in full effect until the expiration date of the Fund’s options contracts. Therefore, while changes in the price of the Underlying Security will result in changes to the Fund’s NAV, the Fund generally anticipates that the rate of change in the Fund’s NAV will be different than that experienced by the Underlying Security.

 

YieldMax(R) SNDK Option Income Strategy ETF | Distribution Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Distribution Risk. The Fund seeks to provide weekly cash distributions. There is no assurance that the Fund will make a distribution in any given week. If the Fund does make distributions, the amounts of such distributions will likely vary greatly from one distribution to the next. Additionally, the weekly distributions, if any, may consist of returns of capital, which would decrease the Fund’s NAV and trading price over time. As a result, an investor may suffer significant losses to their investment. In addition, while the underlying stock may pay dividends, the Fund’s returns will not include any dividends paid by the underlying stock, and any income generated by the Fund may be less than the income generated by a direct investment in the underlying stock.

 

YieldMax(R) SNDK Option Income Strategy ETF | NAV Decline Risk Due to Distributions [Member]  
Prospectus [Line Items]  
Risk [Text Block]

NAV Decline  Risk Due to Distributions. When the Fund makes a distribution, the Fund’s NAV will typically drop by the amount of the distribution on the related ex-dividend date. The repeated payment of distributions by the Fund, if any, may cause the Fund’s NAV and trading price to decline significantly over time. As a result, an investor may suffer significant losses to their investment.

 

YieldMax(R) SNDK Option Income Strategy ETF | Call Strategy Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Call Strategy Risks. The path dependency (i.e., the continued use) of the Fund’s call writing strategy will impact the extent that the Fund participates in the positive price returns of the Underlying Security and, in turn, the Fund’s returns, both during the term of the sold call options and over longer time periods. If, for example, each month the Fund were to sell 7% out-of-the-money call options having a one-month term, the Fund’s participation in the positive price returns of the Underlying Security will be capped at 7% in any given month. However, over a longer period (e.g., 5 months), the Fund should not be expected to participate fully in the first 35% (i.e., 5 months x 7%) of the positive price returns of the Underlying Security, or the Fund may even lose money, even if the Underlying Security share price has appreciated by at least that much over such period, if during any month over that period the Underlying Security had a return less than 7%. This example illustrates that both the Fund’s participation in the positive price returns of the Underlying Security and its returns will depend not only on the price of the Underlying Security but also on the path that the Underlying Security takes over time.

 

Additionally, when implementing the Covered Call Spread Strategy, the use of credit call spreads introduces further complexities and risks. While purchasing a higher-strike call option limits potential losses from the short call position, it also reduces the net premium received, which may result in lower overall returns compared to a stand-alone covered call strategy. If the price of the Underlying Security rises rapidly, the call spread may still cap upside participation, leading to missed profit opportunities. Furthermore, market conditions, such as mispricing between near-the-money and further out-of-the-money options, may impact the effectiveness of the strategy, potentially resulting in lower-than-expected returns or increased losses. The relative pricing of options at different strike levels can vary due to volatility shifts, liquidity constraints, or other market dynamics, adding an additional layer of uncertainty to the Fund’s performance under this strategy.

 

YieldMax(R) SNDK Option Income Strategy ETF | ETF Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks.

 

YieldMax(R) SNDK Option Income Strategy ETF | Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member]  
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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that are authorized to purchase and redeem Shares directly from the Fund (known as “Authorized Participants” or “APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services; or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

YieldMax(R) SNDK Option Income Strategy ETF | Cash Redemption Risk [Member]  
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Cash Redemption Risk. The Fund’s investment strategy may require it to redeem Shares for cash or to otherwise include cash as part of its redemption proceeds. For example, the Fund may not be able to redeem in-kind certain securities held by the Fund (e.g., derivative instruments). In such a case, the Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. By paying out higher annual capital gain distributions, investors may be subjected to increased capital gains taxes. Additionally, there may be brokerage costs or taxable gains or losses that may be imposed on the Fund in connection with a cash redemption that may not have occurred if the Fund had made a redemption in-kind. These costs could decrease the value of the Fund to the extent they are not offset by a transaction fee payable by an AP.

 

YieldMax(R) SNDK Option Income Strategy ETF | Costs of Buying or Selling Shares [Member]  
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Costs of Buying or Selling Shares. Buying or selling Shares involves certain costs, including brokerage commissions, other charges imposed by brokers, and bid-ask spreads. The bid-ask spread represents the difference between the price at which an investor is willing to buy Shares and the price at which an investor is willing to sell Shares. The spread varies over time based on the Shares’ trading volume and market liquidity. The spread is generally lower if Shares have more trading volume and market liquidity and higher if Shares have little trading volume and market liquidity. Due to the costs of buying or selling Shares, frequent trading of Shares may reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

 

YieldMax(R) SNDK Option Income Strategy ETF | Management Risk [Member]  
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Management Risk. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund’s investment portfolio, the portfolio managers will apply investment techniques and risk analyses that may not produce the desired result. There can be no guarantee that the Fund will meet its investment objective.

 

YieldMax(R) SNDK Option Income Strategy ETF | Shares May Trade at Prices Other Than NAV [Member]  
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Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

 

YieldMax(R) SNDK Option Income Strategy ETF | Trading [Member]  
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Trading. Although Shares are listed on a national securities exchange, such as The Nasdaq Stock Market, LLC (the “Exchange”), and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market for the Shares will develop or be maintained or that the Shares will trade with any volume, or at all, on any stock exchange. This risk may be greater for the Fund as it seeks to have indirect exposure to a single underlying stock as opposed to a more diverse portfolio like a traditional pooled investment. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares. Shares trade on the Exchange at a market price that may be below, at or above the Fund’s NAV.

 

YieldMax(R) SNDK Option Income Strategy ETF | Trading Halt Risk [Member]  
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Trading Halt Risk. Trading in Shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Shares inadvisable. In addition, trading in Shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. In the event of an unscheduled market close for options contracts that reference a single stock, such as the Underlying Security’s securities being halted or a market wide closure, settlement prices will be determined by the procedures of the listing exchange of the options contracts. As a result, the Fund could be adversely affected and be unable to implement its investment strategies in the event of an unscheduled closing.

 

YieldMax(R) SNDK Option Income Strategy ETF | Economic and Market Risk [Member]  
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Economic and Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in the general financial markets, a particular financial market, or other asset classes, due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics. The imposition by the U.S. of tariffs on goods imported from foreign countries and reciprocal tariffs levied on U.S. goods by those countries also may lead to volatility and instability in domestic and foreign markets.

 

YieldMax(R) SNDK Option Income Strategy ETF | High Portfolio Turnover Risk [Member]  
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High Portfolio Turnover Risk. The Fund may actively and frequently trade all or a significant portion of the Fund’s holdings. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.

 

YieldMax(R) SNDK Option Income Strategy ETF | Inflation Risk [Member]  
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Inflation Risk. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the present value of the Fund’s assets and distributions, if any, may decline.

 

YieldMax(R) SNDK Option Income Strategy ETF | Liquidity Risk [Member]  
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Liquidity Risk. Some securities held by the Fund, including options contracts, may be difficult to sell or be illiquid, particularly during times of market turmoil. This risk is greater for the Fund as it will hold options contracts on a single security, and not a broader range of options contracts. Markets for securities or financial instruments could be disrupted by a number of events, including, but not limited to, an economic crisis, natural disasters, epidemics/pandemics, new legislation or regulatory changes inside or outside the United States. Illiquid securities may be difficult to value, especially in changing or volatile markets. If the Fund is forced to sell an illiquid security at an unfavorable time or price, the Fund may be adversely impacted. Certain market conditions or restrictions, such as market rules related to short sales, may prevent the Fund from limiting losses, realizing gains or achieving a high correlation with the Underlying Security. There is no assurance that a security that is deemed liquid when purchased will continue to be liquid. Market illiquidity may cause losses for the Fund.

 

YieldMax(R) SNDK Option Income Strategy ETF | Money Market Instrument Risk [Member]  
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Money Market Instrument Risk. The Fund may use a variety of money market instruments for cash management purposes, including money market funds, depositary accounts and repurchase agreements. Repurchase agreements are contracts in which a seller of securities agrees to buy the securities back at a specified time and price. Repurchase agreements may be subject to market and credit risk related to the collateral securing the repurchase agreement. Money market instruments, including money market funds, may lose money through fees or other means.

 

YieldMax(R) SNDK Option Income Strategy ETF | Operational Risk [Member]  
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Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third-parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund, and Adviser seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks.

 

YieldMax(R) SNDK Option Income Strategy ETF | Single Issuer Risk [Member]  
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Single Issuer Risk. Issuer-specific attributes may cause an investment in the Fund to be more volatile than a traditional pooled investment which diversifies risk or the market generally. The value of the Fund, which focuses on an individual security (the Underlying Security), may be more volatile than a traditional pooled investment or the market as a whole and may perform differently from the value of a traditional pooled investment or the market as a whole.

 

YieldMax(R) SNDK Option Income Strategy ETF | Tax Risk [Member]  
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Tax Risk. The Fund intends to elect and to qualify each year to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (“Code”). As a RIC, the Fund will not be subject to U.S. federal income tax on the portion of its net investment income and net capital gain that it distributes to Shareholders, provided that it satisfies certain requirements of the Code. If the Fund does not qualify as a RIC for any taxable year and certain relief provisions are not available, the Fund’s taxable income will be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. To comply with the asset diversification test applicable to a RIC, the Fund will attempt to ensure that the value of options it holds is never 25% of the total value of Fund assets at the close of any quarter. If the Fund’s investments in options were to exceed 25% of the Fund’s total assets at the end of a tax quarter, the Fund, generally, has a grace period to cure such lack of compliance. If the Fund fails to timely cure, it may no longer be eligible to be treated as a RIC.

 

YieldMax(R) SNDK Option Income Strategy ETF | U.S. Government and U.S. Agency Obligations Risk [Member]  
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U.S. Government and U.S. Agency Obligations Risk. The Fund may invest in securities issued by the U.S. government or its agencies or instrumentalities. U.S. Government obligations include securities issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, such as the U.S. Treasury. Payment of principal and interest on U.S. Government obligations may be backed by the full faith and credit of the United States or may be backed solely by the issuing or guaranteeing agency or instrumentality itself. In the latter case, the investor must look principally to the agency or instrumentality issuing or guaranteeing the obligation for ultimate repayment, which agency or instrumentality may be privately owned. There can be no assurance that the U.S. Government would provide financial support to its agencies or instrumentalities (including government-sponsored enterprises) where it is not obligated to do so.

 

YieldMax(R) SNDK Option Income Strategy ETF | Semiconductors & Semiconductor Equipment Industry Risks [Member]  
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Semiconductors & Semiconductor Equipment Industry Risks. Competitive pressures may have a significant effect on the financial condition of semiconductor companies and, as product cycles shorten and manufacturing capacity increases, these companies may become increasingly subject to aggressive pricing, which hampers profitability. Reduced demand for end-user products, under-utilization of manufacturing capacity, and other factors could adversely impact the operating results of companies in the semiconductor industry. Semiconductor companies typically face high capital costs and may be heavily dependent on intellectual property rights. The semiconductor industry is highly cyclical, which may cause the operating results of many semiconductor companies to vary significantly. The industry is complex and global in nature, with manufacturing plants predominantly located in East Asia. Because of this, it is subject to numerous risks, including geopolitical tensions, earthquakes, and extreme weather events. The stock prices of companies in the semiconductor industry have been and likely will continue to be extremely volatile.

 

YieldMax(R) SNDK Option Income Strategy ETF | Indirect Investment in SNDK Risk [Member]  
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Indirect Investment in SNDK Risk. SNDK is not affiliated with the Trust, the Fund, or the Adviser, or their respective affiliates and is not involved with this offering in any way and has no obligation to consider your Shares in taking any corporate actions that might affect the value of Shares. Investors in the Fund will not have voting rights or influence over the management of SNDK but will be exposed to the performance of SNDK (the Underlying Security). Investors will also not have the right to receive dividends or other distributions from SNDK, but will remain subject to price fluctuations and other risks associated with ownership of the Underlying Security.

 

YieldMax(R) SNDK Option Income Strategy ETF | SNDK Trading Risk [Member]  
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SNDK Trading Risk. The trading price of SNDK may be subject to volatility and could experience wide fluctuations due to various factors. Short sellers may also influence SNDK’s trading activity, contributing to market instability. Public perception and external factors beyond the company’s control may influence SNDK’s stock price disproportionately. Additionally, following periods of market volatility, companies have faced securities class action litigation. Any adverse judgment or future stockholder litigation could result in substantial costs and divert management’s attention and resources. In the event of a trading halt, delisting, or significant disruption in the market for SNDK’s shares, the Fund may experience difficulty entering, modifying, or liquidating its exposures. These conditions could impair the Fund’s ability to achieve its investment objective, result in significant tracking error, or, in extreme cases, force the Fund to liquidate entirely.

 

YieldMax(R) SNDK Option Income Strategy ETF | SNDK Performance Risk [Member]  
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SNDK Performance Risk. SNDK may fail to meet its publicly announced guidelines or other expectations about its business, which could cause the price of SNDK to decline. Correctly identifying key factors affecting business conditions and predicting future events is inherently an uncertain process, and the guidance SNDK provides may not ultimately be accurate. If SNDK’s guidance is not accurate or varies from actual results due to its inability to meet the assumptions or the impact on its financial performance that could occur as a result of various risks and uncertainties, the market value of common stock issued by could decline significantly.

 

YieldMax(R) SNDK Option Income Strategy ETF | SNDK Investing Risk [Member]  
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SNDK Investing Risk. SNDK faces risks unique to its operations including, among others, fluctuations in demand and pricing for flash memory and storage products, supply chain or manufacturing disruptions, increased material or labor costs or shortages, rapid technological change, competitive pricing pressures, customer concentration, and the ability to attract, hire and retain key employees or qualified personnel. The trading price of SNDK common stock historically has been and is likely to continue to be volatile. Additionally, SNDK operates in the highly competitive and rapidly evolving semiconductor memory and storage industry, where changes in technology, customer preferences, manufacturing yields, and industry supply-demand dynamics may materially affect its business and operating results. SNDK is a highly dynamic company, and its operations, including its products and services, may change.

 

YieldMax(R) SNDK Option Income Strategy ETF | Risk Lose Money [Member]  
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Risk [Text Block] The Fund may not achieve its investment objective and there is a risk that you could lose all of your money invested in the Fund.
YieldMax(R) SNDK Option Income Strategy ETF | Risk Nondiversified Status [Member]  
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Non-Diversification Risk. Because the Fund is “non-diversified,” it may invest a greater percentage of its assets in the securities of a single issuer or a smaller number of issuers than if it was a diversified fund. As a result, a decline in the value of an investment in a single issuer or a smaller number of issuers could cause the Fund’s overall value to decline to a greater degree than if the Fund held a more diversified portfolio. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance.