Defiance Daily Target 2X Long OPTT ETF OPTT Risks [Member] Indirect Investment in OPTT Risk [Member] OPTT Trading Risk [Member] OPTT Performance Risk [Member] Electrical Equipment Industry Risks [Member] Regulatory Risks [Member] Single Issuer Risk [Member] Compounding and Market Volatility Risk [Member] Daily Correlation/Tracking Risk [Member] Leverage Risk [Member] Derivatives Risk [Member] Swap Agreements [Member] Options Contracts [Member] Counterparty Risk [Member] Intra-Day Investment Risk [Member]  Fixed Income Securities Risk [Member] Rebalancing Risk [Member] ETF Risks [Member] Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member] Cash Redemption Risk [Member] Costs of Buying or Selling Shares [Member] Shares May Trade at Prices Other Than NAV [Member] Trading [Member] Liquidity Risk [Member] Economic and Market Risk [Member] High Portfolio Turnover Risk [Member] Tracking Error Risk [Member] Liquidity Risks [Member] Money Market Instrument Risk [Member] New Fund Risk [Member] Trading Halt Risk [Member] Operational Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] Tax Risk [Member] Defiance Daily Target 2X Long SIDU ETF SIDU Risks [Member] Indirect Investment in SIDU Risk [Member] SIDU Trading Risk [Member] SIDU Performance Risk [Member] Aerospace and Defense Industry Risks [Member] Government Contracts Risks [Member] Defiance Daily Target 2X Long OPTT ETF [Member] Defiance Daily Target 2X Long SIDU ETF [Member] Defiance Daily Target 2X Long OPTT ETF Defiance Daily Target 2X Long OPTT ETF [Member] Defiance Daily Target 2X Long SIDU ETF Defiance Daily Target 2X Long SIDU ETF [Member] Tax Risk. U.S. Government and U.S. Agency Obligations Risk. Operational Risk. Trading Halt Risk. New Fund Risk. Money Market Instrument Risk. Liquidity Risks. Tracking Error Risk. High Portfolio Turnover Risk. Economic and Market Risk. Liquidity Risk. Trading. Shares May Trade at Prices Other Than NAV. Costs of Buying or Selling Shares. Cash Redemption Risk. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Rebalancing Risk. Fixed Income Securities Risk. Intra-Day Investment Risk.  Counterparty Risk. Options Contracts. Swap Agreements. Derivatives Risk. Leverage Risk. Daily Correlation/Tracking Risk. Compounding and Market Volatility Risk. Single Issuer Risk. Government Contracts Risks. Aerospace and Defense Industry Risks. SIDU Performance Risk. SIDU Trading Risk. Indirect Investment in SIDU Risk. SIDU Risks. Regulatory Risks. Electrical Equipment Industry Risks. OPTT Performance Risk. OPTT Trading Risk. Indirect Investment in OPTT Risk. OPTT Risks.