Even Herd Long Short ETF Equity Market Risk [Member] Short Sale Risks [Member] Momentum Investing Risk [Member] Leverage Risk [Member] High Portfolio Turnover Risk [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] Models and Data 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] Economic and Market Risk [Member] Depositary Receipt Risk [Member] Foreign Securities Risk [Member] Derivatives Risk [Member] Swaps Risks [Member] Management Risk [Member] Newer Fund Risk [Member] Newer Sub-Adviser Risk [Member] Operational Risk [Member] Sector Risks [Member] Aerospace & Defense Sector Risk [Member] Banking Sector Risk [Member] Even Herd Long Short ETF [Member] S&P 500 Index (reflects no deduction for fees, expenses, or taxes) Even Herd Long Short ETF Even Herd Long Short ETF [Member] Sector Risks. Operational Risk. Newer Sub-Adviser Risk. Newer Fund Risk. Swaps Risks. Derivatives Risk. Foreign Securities Risk. Depositary Receipt Risk. Economic and Market Risk. Trading. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. Models and Data Risk. Small-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risk. High Portfolio Turnover Risk. Leverage Risk. Momentum Investing Risk. Short Sale Risks. Equity Market Risk. Mid-Capitalization Investing. ETF Risks. Costs of Buying or Selling Shares. Shares May Trade at Prices Other Than NAV. Management Risk. Aerospace & Defense Sector Risk. Banking Sector Risk. S&P 500 Index (reflects no deduction for fees, expenses, or taxes)