v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 62 Months Ended 74 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Guinness Atkinson Alternative Energy Fund            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   26.65% 0.63%     7.78%
Guinness Atkinson Alternative Energy Fund | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [1]   26.65% 0.63%     7.78%
Guinness Atkinson Alternative Energy Fund | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [1]   15.94% 0.51%     6.37%
Guinness Atkinson Asia Focus Fund            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   29.67% (0.68%)     7.23%
Guinness Atkinson Asia Focus Fund | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [2]   27.77% (1.56%)     6.31%
Guinness Atkinson Asia Focus Fund | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [2]   19.10% (0.48%)     5.91%
Guinness Atkinson China & Hong Kong Fund            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   28.96% (4.71%)     3.64%
Guinness Atkinson China & Hong Kong Fund | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [3]   28.81% (5.75%)     2.36%
Guinness Atkinson China & Hong Kong Fund | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [3]   17.55% (3.50%)     2.88%
Guinness Atkinson Global Energy Fund            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   16.90% 18.24%     5.52%
Guinness Atkinson Global Energy Fund | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [4]   16.44% 17.69%     5.16%
Guinness Atkinson Global Energy Fund | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [4]   10.86% 15.13%     4.58%
Guinness Atkinson Global Innovators Fund - Investor Class            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Investor Class Return Before Taxes          
Average Annual Return, Percent   20.24% 11.35%     14.64%
Guinness Atkinson Global Innovators Fund - Investor Class | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Investor Class Return After Taxes on Distributions          
Average Annual Return, Percent [5]   16.10% 8.41%     12.64%
Guinness Atkinson Global Innovators Fund - Investor Class | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Investor Class Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [5]   14.90% 8.50%     11.84%
Guinness Atkinson Global Innovators Fund - Institutional Class            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Institutional Class Return Before Taxes          
Average Annual Return, Percent [6]   20.54% 11.63%     14.92%
Guinness Atkinson Asia Pacific Dividend Builder ETF            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   22.42% 7.53%     9.37%
Guinness Atkinson Asia Pacific Dividend Builder ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [7]   21.43% 5.73%     7.71%
Guinness Atkinson Asia Pacific Dividend Builder ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [7]   13.65% 5.29%     7.06%
Guinness Atkinson Dividend Builder ETF            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   11.57% 10.44%     11.25%
Guinness Atkinson Dividend Builder ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [8]   10.88% 9.40%     10.42%
Guinness Atkinson Dividend Builder ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [8]   7.33% 8.05%     9.12%
Guinness Atkinson Smart Transportation & Technology ETF            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   27.55% 7.24%   15.19%  
Performance Inception Date Nov. 14, 2019          
Guinness Atkinson Smart Transportation & Technology ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [9]   27.44% 6.91%   14.70%  
Guinness Atkinson Smart Transportation & Technology ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [9]   16.71% 5.67%   12.30%  
Guinness Atkinson Sustainable Energy ETF            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return Before Taxes          
Average Annual Return, Percent   26.44% 1.80% 5.14%    
Performance Inception Date Nov. 11, 2020          
Guinness Atkinson Sustainable Energy ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Average Annual Return, Percent [10]   26.36% 1.46% 4.81%    
Guinness Atkinson Sustainable Energy ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Average Annual Return, Percent [10]   15.90% 1.31% 3.94%    
MSCI World Index (Net Return)            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI World Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent   21.09% 12.14% 13.19% 13.24% 12.16%
MSCI AC Asia Pacific ex Japan Index            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI AC Asia Pacific ex Japan Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent [11],[12]   29.56% 4.19%     8.46%
MSCI AC Far East ex Japan Index            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI AC Far East ex Japan Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent   40.69% 3.19%     8.47%
MSCI China Index (Net Return)            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI China Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent   31.17% (3.19%)     5.53%
MSCI World Energy Index (Net Return)            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI World Energy Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent   13.32% 19.53%     7.62%
MSCI AC Pacific ex Japan Index            
Prospectus [Line Items]            
Average Annual Return, Label [Optional Text] MSCI AC Pacific ex Japan Index (Net Return) (Reflects No Deductions for Fees and Expenses)          
Average Annual Return, Percent   35.79% 3.77%     8.39%
[1] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[2] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[3] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[4] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[5] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor. After-tax returns are shown for Investor Class Shares only and after-tax returns for classes other than Investor Class will vary from returns shown for Investor Class.
[6] The Fund’s Institutional Class shares were issued on December 31, 2015. Performance information shown for the Institutional Class prior to December 31, 2015, is based on the performance of the Investor Class.
[7] This table shows returns for the predecessor mutual fund. After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their mutual fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[8] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[9] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[10] After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
[11] As of May 1, 2026, the Fund’s primary benchmark is MSCI AC Asia Pacific ex Japan Index (NR), which provides a more accurate and relevant performance evaluation. The change in benchmark does not reflect any change in the Fund’s investment objectives, policies or strategies.
[12] As of May 1, 2026, the Fund’s primary benchmark is MSCI AC Asia Pacific ex Japan Index (NR), which provides a more accurate and relevant performance evaluation. The change in benchmark does not reflect any change in the Fund’s investment objectives, policies or strategies.