REX Drone ETF AUTHORIZED PARTICIPANTS, MARKET MAKERS, AND LIQUIDITY PROVIDERS LIMITATION RISK [Member] CONCENTRATION RISK [Member] COSTS OF BUYING AND SELLING FUND SHARES RISK [Member] CURRENCY RISK [Member] CYBER SECURITY RISK [Member] DEPOSITARY RECEIPTS RISK [Member] DIVIDEND RISK [Member] DRONE AND UAV COMPANIES RISK [Member] EQUITY SECURITIES RISK [Member] HIGH PORTFOLIO TURNOVER RISK [Member] INDEX PROVIDER RISK [Member] INDUSTRIALS COMPANIES RISK [Member] INTERNATIONAL CLOSED MARKET TRADING RISK [Member] LARGE CAPITALIZATION COMPANIES RISK [Member] MARKET MAKER RISK [Member] MARKET RISK [Member] NEW FUND RISK [Member] NON-CORRELATION RISK [Member] NON-U.S. SECURITIES RISK [Member] OPERATIONAL RISK [Member] PASSIVE INVESTMENT RISK [Member] PREMIUM/DISCOUNT RISK [Member] SMALL AND/OR MID CAPITALIZATION COMPANIES RISK [Member] TRADING ISSUES RISK [Member] REX Drone ETF [Member] REX Drone ETF. REX Drone ETF. Trading Issues Risk. Small and/or Mid Capitalization Companies Risk. Premium/Discount Risk. Passive Investment Risk. Operational Risk. Non-U.S. Securities Risk. Non-Correlation Risk. New Fund Risk. Market Risk. Market Maker Risk. Large Capitalization Companies Risk. International Closed Market Trading Risk. Industrials Companies Risk. Index Provider Risk. High Portfolio Turnover Risk. Equity Securities Risk. Drone and Uav Companies Risk. Dividend Risk. Depositary Receipts Risk. Cyber Security Risk. Currency Risk. Costs of Buying and Selling Fund Shares Risk. Concentration Risk. Authorized Participants, Market Makers, and Liquidity Providers Limitation Risk.