v3.26.3
Annual Total Returns
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Tandem Fund | Tandem Fund Shares          
Prospectus [Line Items]          
Annual Return [Percent] 3.65% 7.64% 8.41% (7.39%) 19.07%