Defiance S&P Accelerator ETF Equity Market Risk [Member] Focused Portfolio Risk [Member] Concentration Risk [Member] Management Risk [Member] Risks Related to Changes in Government Policies and Institutions [Member] Derivatives Risk [Member] Options Contracts [Member] Swap Agreements [Member] Equity Total Return Swaps [Member] Counterparty Risk [Member] Cyber Security 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 Risks [Member] Economic and Market Risk [Member] Portfolio Turnover Risk [Member] Liquidity Risk [Member] Money Market Instrument Risk [Member] New Fund Risk [Member] Operational Risk [Member] IPO/SPAC/de-SPAC Risk [Member] Warrants and Rights Risk [Member] Tax Risk [Member] Technology Sector Risk [Member] Defiance S&P Accelerator ETF [Member] Defiance S&P Accelerator ETF. Defiance S&P Accelerator ETF. Technology Sector Risk. Tax Risk. Warrants and Rights Risk. IPO/SPAC/de-SPAC Risk. Operational Risk. New Fund Risk. Money Market Instrument Risk. Liquidity Risk. Portfolio Turnover Risk. Economic and Market Risk. Liquidity Risks. 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. Cyber Security Risk. Counterparty Risk. Equity Total Return Swaps. Swap Agreements. Options Contracts. Derivatives Risk. Risks Related to Changes in Government Policies and Institutions. Management Risk. Concentration Risk. Focused Portfolio Risk. Equity Market Risk.