Guinness Atkinson Global Innovators Fund Guinness Atkinson Global Innovators Fund - ETF Class Guinness Atkinson Global Innovators Fund - Institutional Class Guinness Atkinson Global Innovators Fund - Investor Class Industry Risks [Member] Equity Securities Risk [Member] Market Risk [Member] Risks of Investing in ETF Shares [Member] Financial Services Sector Risk [Member] Global Risks [Member] Risks Associated With Investments In Companies Outside The United States [Member] Currency And Currency Exchange Risks [Member] Foreign Securities Market Risks [Member] Emerging Markets Risks [Member] Expropriation Risk [Member] Management Risk [Member] Capitalization Risk [Member] Liquidity Risk [Member] Fund Cybersecurity Risk [Member] MSCI World Index (Net Return) (Reflects No Deductions for Fees and Expenses) C000016119 Member Market Risk Member Global Risks Member index_ MSCI_ World_ Index_ Net_ Return_ Reflects_ No_ Deductions_for_ Fees_and_ Expenses Member Industry Risks Member Foreign Securities Market Risks Member Emerging Markets Risks Member Financial Services Sector Risk Member Management Risk Member Expropriation Risk Member Equity Securities Risk Member Fund Cybersecurity Risk Member S000005895 Member Currency And Currency Exchange Risks Member Risks Associated With Investments In Companies Outside The United States Member Risks Of Investing In ETFShares Member C000161072 Member Capitalization Risk Member C000276662 Member Liquidity Risk Member