v3.25.2
Emerging Markets Equity Select ETF Average Annual Total Returns
12 Months Ended 60 Months Ended 90 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Nasdaq Riskalyze Emerging Markets(TM) Index (reflects no deduction for fees, expenses or taxes)[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   1.43% 4.01% 5.14%
MSCI Emerging Markets Index (reflects no deduction for fees, expenses or taxes)[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   7.50% 1.70% 3.35%
Nasdaq Emerging Large Mid Cap(TM) Index (reflects no deduction for fees, expenses or taxes)[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   13.01% 3.05% 5.04%
Emerging Markets Equity Select ETF        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.59%) 1.85% 3.02%
Performance Inception Date Jun. 20, 2017      
Emerging Markets Equity Select ETF | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   (1.90%) 0.65% 1.77%
Emerging Markets Equity Select ETF | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.32%) 0.87% 1.76%