v3.25.4
Shareholder Report, Average Annual Return (Details)
12 Months Ended 15 Months Ended 27 Months Ended 28 Months Ended 42 Months Ended 47 Months Ended 50 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000253738                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000066393                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000051120                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000102898                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000076451                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000146000                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000138289                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000236336                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000240390                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000232971                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000024980                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000231316                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000082390                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000070695                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000102897                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000127738                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000088891                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000081187                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000047031                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000102386                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000064328                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000244874                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000158570                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000105866                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000114511                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000092114                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000047032                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000098930                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000037682                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000051121                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
C000066397                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Fund                
Without Sales Load [Member] | C000253738                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 6.94% 7.82%              
Without Sales Load [Member] | C000066393                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 68.50%             7.67% 6.62%
Without Sales Load [Member] | C000051120                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 15.03%             1.04% 6.64%
Without Sales Load [Member] | C000102898                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent (4.62%)             12.25% 9.73%
Without Sales Load [Member] | C000076451                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 53.82%             (1.41%) 8.41%
Without Sales Load [Member] | C000146000                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 6.04%             1.66% 2.30%
Without Sales Load [Member] | C000138289                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 58.93%             (0.26%) 1.54%
Without Sales Load [Member] | C000236336                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 5.76%       7.52%        
Without Sales Load [Member] | C000240390                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 8.42%     4.56%          
Without Sales Load [Member] | C000232971                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent (5.95%)         4.03%      
Without Sales Load [Member] | C000024980                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 155.57%             20.66% 21.29%
Without Sales Load [Member] | C000231316                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 79.63%           3.63%    
Without Sales Load [Member] | C000082390                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent (4.92%)             8.55% 1.61%
Without Sales Load [Member] | C000070695                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 13.19%             (1.26%) 1.37%
Without Sales Load [Member] | C000102897                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 12.72%             1.90% 4.77%
Without Sales Load [Member] | C000127738                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 37.28%             7.04% 8.73%
Without Sales Load [Member] | C000088891                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 18.21%             0.81% 3.04%
Without Sales Load [Member] | C000081187                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 173.25%             17.86% 21.35%
Without Sales Load [Member] | C000047031                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 32.88%             (3.52%) 10.19%
Without Sales Load [Member] | C000102386                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 12.73%             2.49% 4.07%
Without Sales Load [Member] | C000064328                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 34.72%             12.19% 11.36%
Without Sales Load [Member] | C000244874                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent (10.37%)   6.87%            
Without Sales Load [Member] | C000158570                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 38.75%             12.11% 9.67%
Without Sales Load [Member] | C000105866                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 6.67%             14.67% (4.45%)
Without Sales Load [Member] | C000114511                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 9.44%             3.78% 5.53%
Without Sales Load [Member] | C000092114                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 92.05%             4.69% 9.31%
Without Sales Load [Member] | C000047032                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 3.64%             (18.92%) (3.61%)
Without Sales Load [Member] | C000098930                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 215.15%             (21.72%) (3.98%)
Without Sales Load [Member] | C000037682                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 47.16%             18.21% 19.77%
Without Sales Load [Member] | C000051121                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 55.94%             22.99% 13.76%
Without Sales Load [Member] | C000066397                  
Average Annual Return [Line Items]                  
Average Annual Return, Percent 62.42%             2.85% 3.75%
ICE BofA US Broad Market Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA US Broad Market Index                
Average Annual Return, Percent 7.15% 2.80%              
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
S&P 500 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name S&P 500 Index                
Average Annual Return, Percent 17.88%             14.42% 14.82%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
ICE BofA Global Broad Market Plus Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA Global Broad Market Plus Index                
Average Annual Return, Percent 8.05%             (2.41%) 1.11%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
ICE BofA US Broad Market Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA US Broad Market Index                
Average Annual Return, Percent 7.15%       3.53%        
S&P 500 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name S&P 500 Index                
Average Annual Return, Percent 17.88%     22.25%          
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%         11.16%      
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%           9.07%    
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
ICE BofA Global Broad Market Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA Global Broad Market Index                
Average Annual Return, Percent 8.08%             (2.52%) 1.02%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
ICE BofA Global Broad Market Plus Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA Global Broad Market Plus Index                
Average Annual Return, Percent 8.05%             (2.41%) 1.11%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
S&P 500 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name S&P 500 Index                
Average Annual Return, Percent 17.88%             14.42% 14.82%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
S&P 500 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name S&P 500 Index                
Average Annual Return, Percent 17.88%   22.49%            
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
ICE BofA US Broad Market Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA US Broad Market Index                
Average Annual Return, Percent 7.15%             (0.42%) 2.01%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
MSCI ACWI Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MSCI ACWI Index                
Average Annual Return, Percent 22.34%             11.19% 11.72%
J.P. Morgan CLOIE Balanced Mezzanine Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name J.P. Morgan CLOIE Balanced Mezzanine Index                
Average Annual Return, Percent 7.10% 7.92%              
MVIS® GDP Africa Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> GDP Africa Index                
Average Annual Return, Percent 69.57%             10.65% 8.85%
MVIS® Global Agribusiness Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Agribusiness Index                
Average Annual Return, Percent 15.15%             1.23% 6.70%
MVIS® US Business Development Companies Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> US Business Development Companies Index                
Average Annual Return, Percent (4.45%)             11.93% 9.44%
MVIS® Brazil Small-Cap Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Brazil Small-Cap Index                
Average Annual Return, Percent 54.99%             (0.68%) 9.12%
S&P 500 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name S&P 500 Index                
Average Annual Return, Percent 17.88%             14.42% 14.82%
FTSE Chinese Broad Bond 0-10 Years Diversified Select Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name FTSE Chinese Broad Bond 0-10 Years Diversified Select Index                
Average Annual Return, Percent 6.46%             2.50% 3.17%
ChiNext Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ChiNext Index                
Average Annual Return, Percent 58.91%             (0.03%) 3.02%
J.P. Morgan CLO IG Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name J.P. Morgan CLO IG Index                
Average Annual Return, Percent 5.70%       7.37%        
J.P. Morgan Collateralized Loan Obligation Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name J.P. Morgan Collateralized Loan Obligation Index                
Average Annual Return, Percent 5.87%       7.75%        
Bloomberg Commodity Index Total Return                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Bloomberg Commodity Index Total Return                
Average Annual Return, Percent 15.77%     7.14%          
UBS CM Commodity Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name UBS CM Commodity Index                
Average Annual Return, Percent 9.55%     5.61%          
MVIS® Digital India Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Digital India Index                
Average Annual Return, Percent (7.20%)         6.01%      
MarketVector™ Global Gold Miners Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MarketVector™ Global Gold Miners Index                
Average Annual Return, Percent 157.39%             21.13% 21.79%
NYSE Arca Gold Miners Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name NYSE Arca Gold Miners Index                
Average Annual Return, Percent 158.28%             21.22% 21.83%
MVIS® Global Clean-Tech Metals Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Clean-Tech Metals Index                
Average Annual Return, Percent 80.44%           4.14%    
Market Grader India All-Cap Growth Leaders Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name Market Grader India All-Cap Growth Leaders Index                
Average Annual Return, Percent (4.10%)             9.87% 2.56%
MVIS® Indonesia Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Indonesia Index                
Average Annual Return, Percent 13.50%             (1.00%) 1.67%
ICE BofA ML Global ex-US Issuers High Yield Constrained Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE BofA ML Global ex-US Issuers High Yield Constrained Index                
Average Annual Return, Percent 13.08%             2.34% 5.33%
BlueStar® Israel Global Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name BlueStar<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Israel Global Index                
Average Annual Return, Percent 37.93%             7.54% 9.16%
JPMorgan GBI-EMG Core Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name JPMorgan GBI-EMG Core Index                
Average Annual Return, Percent 19.00%             0.98% 3.46%
MVIS® Global Junior Gold Miners Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Junior Gold Miners Index                
Average Annual Return, Percent 176.50%             18.67% 21.87%
MVIS® Global Low Carbon Energy Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Low Carbon Energy Index                
Average Annual Return, Percent 33.32%             (3.22%) 10.52%
MVIS® US Mortgage REITs Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> US Mortgage REITs Index                
Average Annual Return, Percent 12.96%             2.28% 4.08%
MarketVector™ Global Natural Resources Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MarketVector™ Global Natural Resources Index                
Average Annual Return, Percent 34.79%             12.26% 11.45%
MarketVector™ US Listed Office and Commercial REITs Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MarketVector™ US Listed Office and Commercial REITs Index                
Average Annual Return, Percent (10.03%)   7.34%            
MVIS® Global Oil Refiners Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Oil Refiners Index                
Average Annual Return, Percent 39.39%             12.20% 9.67%
MVIS® US Listed Oil Services 25 Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> US Listed Oil Services 25 Index                
Average Annual Return, Percent 6.77%             14.92% (4.49%)
ICE Exchange-Listed Fixed & Adjustable Rate Non-Financial Preferred Securities Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name ICE Exchange-Listed Fixed & Adjustable Rate Non-Financial Preferred Securities Index                
Average Annual Return, Percent 9.12%             4.07% 5.63%
MVIS® Global Rare Earth/Strategic Metals Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Rare Earth/Strategic Metals Index                
Average Annual Return, Percent 90.39%             4.77% 8.90%
MarketVector™ Global Steel Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MarketVector™ Global Steel Index                
Average Annual Return, Percent 48.36%             19.15% 20.44%
NYSE Arca Steel Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name NYSE Arca Steel Index                
Average Annual Return, Percent 46.43%             18.83% 20.28%
MVIS® Global Uranium & Nuclear Energy Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Global Uranium & Nuclear Energy Index                
Average Annual Return, Percent 55.82%             23.01% 13.53%
MarketVector™ Vietnam Local Index                  
Average Annual Return [Line Items]                  
Line Graph and Table Measure Name MarketVector™ Vietnam Local Index                
Average Annual Return, Percent 64.05%             3.95% 4.64%