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CONTRACTS AND AGREEMENTS - Brokerage commission (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
CONTRACTS AND AGREEMENTS        
Total commissions accrued to brokers $ 352,575 $ 368,938 $ 1,133,961 $ 1,110,080
Commission        
CONTRACTS AND AGREEMENTS        
Total commissions accrued to brokers     $ 1,133,961 $ 1,110,080
Total commissions as annualized percentage of average total net assets 0.15% 0.11% 0.15% 0.11%