v3.26.1
Shareholder Report, Average Annual Return (Details)
 6 Months Ended 12 Months Ended 60 Months Ended 80 Months Ended 120 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Guinness Atkinson Alternative Energy Fund              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Alternative Energy Fund          
Average Annual Return, Percent     14.96% 29.85% 2.31%   10.81%
Guinness Atkinson Asia Focus Fund              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Asia Focus Fund          
Average Annual Return, Percent     13.53% 28.65% 1.28%   8.10%
Guinness Atkinson China & Hong Kong Fund              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson China & Hong Kong Fund          
Average Annual Return, Percent     (10.95%) 2.82% (7.69%)   2.92%
Guinness Atkinson Global Energy Fund              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Global Energy Fund          
Average Annual Return, Percent     20.61% 33.87% 15.53%   6.02%
Guinness Atkinson Global Innovators Fund - Investor Class              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Global Innovators Fund - Investor Class          
Average Annual Return, Percent     7.19% 16.83% 9.91%   15.71%
Guinness Atkinson Global Innovators Fund - Institutional Class              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Global Innovators Fund - Institutional Class          
Average Annual Return, Percent     7.33% 17.12% 10.18%   16.00%
Guinness Atkinson Asia Pacific Dividend Builder ETF              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Asia Pacific Dividend Builder ETF          
Average Annual Return, Percent     3.92% 9.79% 6.00%   9.10%
Guinness Atkinson Dividend Builder ETF              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Dividend Builder ETF          
Average Annual Return, Percent     7.11% 9.82% 9.28%   11.49%
Guinness Atkinson Real Assets Income ETF              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Guinness Atkinson Real Assets Income ETF          
Average Annual Return, Percent 11.59%   10.18%        
Guinness Atkinson Smart Transportation & Technology ETF              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   Smart Transportation & Technology ETF          
Average Annual Return, Percent     21.04% 39.57% 9.09% 17.31%  
Guinness Atkinson Alternative Energy Fund | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47%   13.13%
Guinness Atkinson Asia Focus Fund | MSCI AC Asia Pacific ex Japan Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI AC Asia Pacific ex Japan Index (Net Return)          
Average Annual Return, Percent     23.93% 40.75% 7.32%   10.56%
Guinness Atkinson China & Hong Kong Fund | MSCI China Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI China Index (Net Return)          
Average Annual Return, Percent     (14.97%) (4.94%) (6.62%)   4.34%
Guinness Atkinson Global Energy Fund | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47%   13.13%
Guinness Atkinson Global Innovators Fund - Investor Class | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47%   13.13%
Guinness Atkinson Global Innovators Fund - Institutional Class | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47%   13.13%
Guinness Atkinson Asia Pacific Dividend Builder ETF | MSCI AC Asia Pacific ex Japan Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI AC Asia Pacific ex Japan Index (Net Return)          
Average Annual Return, Percent     23.93% 40.75% 7.32%   10.56%
Guinness Atkinson Dividend Builder ETF | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47%   13.13%
Guinness Atkinson Real Assets Income ETF | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent 10.14%   9.69%        
Guinness Atkinson Smart Transportation & Technology ETF | MSCI World Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Index (Net Return)          
Average Annual Return, Percent     9.69% 21.34% 11.47% 13.77%  
Guinness Atkinson Asia Focus Fund | MSCI AC Far East ex Japan Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI AC Far East ex Japan Index (Net Return)          
Average Annual Return, Percent     33.82% 61.07% 8.17%   11.43%
Guinness Atkinson Global Energy Fund | MSCI World Energy Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Energy Index (Net Return)          
Average Annual Return, Percent     18.51% 28.45% 16.92%   7.83%
Guinness Atkinson Asia Pacific Dividend Builder ETF | MSCI AC Pacific ex Japan Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI AC Pacific ex Japan Index (Net Return)          
Average Annual Return, Percent     29.98% 52.27% 8.03%   11.00%
Guinness Atkinson Real Assets Income ETF | MSCI World Core Infrastructure Index (Net Return)              
Average Annual Return [Line Items]              
Line Graph and Table Measure Name   MSCI World Core Infrastructure Index (Net Return)          
Average Annual Return, Percent 10.28%   9.00%