VistaShares ACKtivist Select ETF VistaShares ACKtivist Select ETF [Member] Index / Strategy Risks [Member] Equity Market Risk [Member] Derivatives Risk [Member] Options Contracts [Member] Swap Agreements [Member] Counterparty Risk [Member] Concentration Risk [Member] Ground Transportation Industry Risk [Member] Hotels, Restaurants & Leisure Industry Risks [Member] Economic and Market Risk [Member] ETF Risks [Member] Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member] Costs of Buying or Selling Shares [Member] Shares May Trade at Prices Other Than NAV [Member] Trading [Member] Focused Portfolio Risk [Member] Foreign Securities Risk [Member] Depositary Receipt Risk [Member] High Portfolio Turnover Risk [Member] Inflation Risk [Member] Management Risk [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] New Fund Risk [Member] Newer Sub-Adviser Risk [Member] Operational Risk [Member] Tax Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] VistaShares Target 15 ACKtivist Distribution ETF VistaShares Target 15 ACKtivist Distribution ETF [Member] Distribution Risk [Member] NAV Decline Risk Due to Distributions [Member] Cash Redemption Risk [Member] VistaShares BigShort Select ETF VistaShares BigShort Select ETF [Member] Semiconductors & Semiconductor Equipment Industry Risk [Member] Emerging Markets Risk [Member] VistaShares Target 15 BigShort Distribution ETF VistaShares Target 15 BigShort Distribution ETF [Member] VistaShares DRUKMacro Select ETF VistaShares DRUKMacro Select ETF [Member] VistaShares Target 15 DRUKMacro Distribution ETF VistaShares Target 15 DRUKMacro Distribution ETF [Member] VistaShares Berkshire Select ETF VistaShares Berkshire Select ETF [Member] VistaShares ACKtivist Select ETF. VistaShares ACKtivist Select ETF. VistaShares Target 15 ACKtivist Distribution ETF. VistaShares Target 15 ACKtivist Distribution ETF. VistaShares BigShort Select ETF. VistaShares BigShort Select ETF. VistaShares Target 15 BigShort Distribution ETF. VistaShares Target 15 BigShort Distribution ETF. VistaShares DRUKMacro Select ETF. VistaShares DRUKMacro Select ETF. VistaShares Target 15 DRUKMacro Distribution ETF. VistaShares Target 15 DRUKMacro Distribution ETF. VistaShares Berkshire Select ETF. VistaShares Berkshire Select ETF. U.S. Government and U.S. Agency Obligations Risk. Tax Risk. Operational Risk. Newer Sub-Adviser Risk. New Fund Risk. Mid-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risk. Management Risk. Inflation Risk. High Portfolio Turnover Risk. Depositary Receipt Risk. Emerging Markets Risk. Foreign Securities Risk. Focused Portfolio Risk. Trading. Shares May Trade at Prices Other Than NAV. Costs of Buying or Selling Shares. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Economic and Market Risk. Concentration Risk. Counterparty Risk. Swap Agreements. Options Contracts. Derivatives Risk Equity Market Risk. Index / Strategy Risks. Small-Capitalization Investing. Cash Redemption Risk. NAV Decline Risk Due to Distributions. Distribution Risk. Semiconductors & Semiconductor Equipment Industry Risk. Hotels, Restaurants & Leisure Industry Risks. Ground Transportation Industry Risk.