Return Stacked(R) Bonds & Futures Yield ETF Derivatives Risk [Member] Futures Contracts [Member] Swaps [Member] Cayman Subsidiary Risk [Member] Bond Risks [Member] Equity Market Risk [Member] Commodities Risk [Member] Commodity-Linked Derivatives Tax Risk [Member] Commodity Pool Regulatory Risk [Member] Tax Risk [Member] Credit Risk [Member] Currency Risk [Member] Foreign Investment Risk [Member] Interest Rate Risk [Member] High Portfolio Turnover Risk [Member] Leverage Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] Underlying ETFs Risks [Member] Counterparty 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] Economic and Market Risk [Member] Illiquid Investments Risk [Member] Management Risk [Member] Models and Data Risk [Member] Newer Fund Risk [Member] Operational Risk [Member] Return Stacked(R) Bonds & Managed Futures ETF Return Stacked(R) Bonds & Merger Arbitrage ETF Options Contracts [Member] Swap Agreements [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] Short Sale Risk [Member] Index Strategy Risk [Member] Passive Investment Risk [Member] Merger-Arbitrage Risk [Member] Tracking Error Risk [Member] Money Market Instrument Risk [Member] Return Stacked(R) Global Stocks & Bonds ETF Emerging Markets Risk [Member] Return Stacked(R) U.S. Stocks & Futures Yield ETF Return Stacked(R) U.S. Stocks & Managed Futures ETF Return Stacked(R) U.S. Stocks & Gold/Bitcoin ETF Bitcoin Investment Risks [Member] Digital Assets Risk [Member] Digital Asset Markets Risk [Member] Blockchain Technology Risk [Member] Gold Investment Risks [Member] Concentration Risk [Member] Underlying Funds Risk [Member] Underlying Bitcoin Fund Risks [Member] Underlying Gold Fund Risks [Member] Potentially No 1940 Act Protections [Member] Reverse Repurchase Agreement Risk [Member] New Fund Risk [Member] Return Stacked(R) Bonds & Futures Yield ETF [Member] Return Stacked(R) Bonds & Managed Futures ETF [Member] Return Stacked(R) Bonds & Merger Arbitrage ETF [Member] Return Stacked(R) Global Stocks & Bonds ETF [Member] Return Stacked(R) U.S. Stocks & Futures Yield ETF [Member] Return Stacked(R) U.S. Stocks & Managed Futures ETF [Member] Return Stacked(R) U.S. Stocks & Gold/Bitcoin ETF [Member] Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Treasury Index (reflects no deduction for fees, expenses, or taxes) S&P 500 Total Return Index (reflects no deduction for fees, expenses, or taxes) S&P Composite 1500 Index (reflects no deduction for fees, expenses, or taxes) Return Stacked(R) Bonds & Futures Yield ETF. Return Stacked(R) Bonds & Futures Yield ETF [Member] Return Stacked(R) Bonds & Managed Futures ETF. Return Stacked(R) Bonds & Managed Futures ETF [Member] Return Stacked(R) Bonds & Merger Arbitrage ETF. Return Stacked(R) Bonds & Merger Arbitrage ETF [Member] Return Stacked(R) Global Stocks & Bonds ETF. Return Stacked(R) Global Stocks & Bonds ETF [Member] Return Stacked(R) U.S. Stocks & Futures Yield ETF. Return Stacked(R) U.S. Stocks & Futures Yield ETF [Member] Return Stacked(R) U.S. Stocks & Managed Futures ETF. Return Stacked(R) U.S. Stocks & Managed Futures ETF [Member] Return Stacked(R) U.S. Stocks & Gold/Bitcoin ETF. Return Stacked(R) U.S. Stocks & Gold/Bitcoin ETF [Member] U.S. Government and U.S. Agency Obligations Risk. Operational Risk. New Fund Risk. Money Market Instrument Risk. Costs of Buying or Selling Shares. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Economic and Market Risk. Counterparty Risk. Management Risk. High Portfolio Turnover Risk. Large-Capitalization Investing. Market Capitalization Risk. Reverse Repurchase Agreement Risk. Underlying Gold Fund Risks. Underlying Bitcoin Fund Risks. Underlying Funds Risk. Concentration Risk. Leverage Risk. Tax Risk. Commodity Pool Regulatory Risk. Commodity-Linked Derivatives Tax Risk. Cayman Subsidiary Risk. Swaps. Futures Contracts. Derivatives Risk. Gold Investment Risks. Bitcoin Investment Risks. Equity Market Risk. Models and Data Risk. Illiquid Investments Risk. Trading. Shares May Trade at Prices Other Than NAV. Cash Redemption Risk. Underlying ETFs Risks. Foreign Investment Risk. Currency Risk. Bond Risks. Commodities Risk. Emerging Markets Risk. Tracking Error Risk. Merger-Arbitrage Risk. Passive Investment Risk. Index Strategy Risk. Short Sale Risk. Mid-Capitalization Investing. Swap Agreements. Options Contracts. Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) S&P 500 Total Return Index (reflects no deduction for fees, expenses, or taxes) Small-Capitalization Investing. Digital Assets Risk. Digital Asset Markets Risk. Blockchain Technology Risk. Bloomberg U.S. Treasury Index (reflects no deduction for fees, expenses, or taxes) Newer Fund Risk. S&P Composite 1500 Index (reflects no deduction for fees, expenses, or taxes) Potentially No 1940 Act Protections.