Guinness Atkinson(TM) K-Beauty ETF Guinness Atkinson(TM) K-Beauty ETF Thematic Investing Risk [Member] Geographic Concentration/South Korea Risk [Member] Foreign Securities Risk [Member] Currency Risk [Member] Foreign Custody and Settlement Risk [Member] International Closed-Market Trading and Premium/Discount Risk [Member] Cash Transactions Risk [Member] Industry Concentration Risk [Member] Consumer and Personal-Care Industry Risk [Member] Aesthetics and Dermatology (Health-Care) Industry Risk [Member] Non-Diversification Risk [Member] Small- and Mid-Capitalization Company Risk [Member] Liquidity Risk [Member] Passive Strategy/Index Tracking Risk [Member] Index Provider and Index Methodology Risk [Member] Portfolio Turnover Risk [Member] New Fund Risk [Member] Equity Securities Risk [Member] Market and Global Risk [Member] Fund Cybersecurity Risk [Member] Risks of Investing in ETFs [Member] Index Provider And Index Methodology Risk Member Risks Of Investing In ETFs Member S000109351 Member Aesthetics And Dermatology Health Care Industry Risk Member Non Diversification Risk Member International Closed Market Trading And Premium Discount Risk Member Small And Mid Capitalization Company Risk Member Fund Cybersecurity Risk Member New Fund Risk Member Consumer And Personal Care Industry Risk Member Thematic Investing Risk Member Foreign Custody And Settlement Risk Member Market And Global Risk Member Liquidity Risk Member Foreign Securities Risk Member Geographic Concentration South Korea Risk Member C000280460 Member Passive Strategy Index Tracking Risk Member Portfolio Turnover Risk Member Currency Risk Member Cash Transactions Risk Member Industry Concentration Risk Member Equity Securities Risk Member