Cambria Chesapeake Pure Trend ETF Counterparty Risk [Member] Commodities Risk [Member] Energy Commodities Risk [Member] Precious Metal Commodities Risk [Member] Industrial Metal Commodities Risk [Member] Grains Commodities Risk [Member] Equity Market Risk [Member] Fixed Income Securities Risk [Member] Currency Risk [Member] Credit Risk [Member] Foreign Securities Risk [Member] Leverage Risk [Member] Derivatives Risk [Member] Futures Contracts Risk [Member] Forward Currency Contracts Risk [Member] Options Contracts Risk [Member] Cayman Subsidiary Risk [Member] Short Exposure Risk [Member] Tax Risk [Member] Sub-Adviser Strategy Risk [Member] Commodity-Linked Derivatives Tax Risk [Member] Commodity Pool Regulatory Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] Cryptocurrency Risk [Member] Economic and Market 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] High Portfolio Turnover Risk [Member] Illiquid Investments Risk [Member] Interest Rate Risk [Member] Management Risk [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] Micro-Capitalization Investing [Member] Operational Risk [Member] Cambria Chesapeake Pure Trend ETF [Member] S&P 500® Total Return Index (reflects no deduction for fees, expenses, or taxes) Cambria Chesapeake Pure Trend ETF. Cambria Chesapeake Pure Trend ETF. Operational Risk. Micro-Capitalization Investing. Small-Capitalization Investing. Mid-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risk. Management Risk. Illiquid Investments Risk. High Portfolio Turnover 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. Economic and Market Risk. U.S. Government and U.S. Agency Obligations Risk. Commodity Pool Regulatory Risk. Commodity-Linked Derivatives Tax Risk. Sub-Adviser Strategy Risk. Tax Risk. Cayman Subsidiary Risk. Forward Currency Contracts Risk. Derivatives Risk. Leverage Risk. Foreign Securities Risk. Currency Risk. Fixed Income Securities Risk. Equity Market Risk. Grains Commodities Risk. Industrial Metal Commodities Risk. Precious Metal Commodities Risk. Energy Commodities Risk. Commodities Risk. Counterparty Risk. Cryptocurrency Risk. Short Exposure Risk. Options Contracts Risk. Futures Contracts Risk. S&P 500® Total Return Index (reflects no deduction for fees, expenses, or taxes)