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CONTRACTS AND AGREEMENTS - Brokerage commission (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
CONTRACTS AND AGREEMENTS        
Total commissions accrued to brokers $ 435,102 $ 347,096 $ 781,386 $ 741,142
Commission        
CONTRACTS AND AGREEMENTS        
Total commissions accrued to brokers     $ 781,386 $ 741,142
Total commissions as annualized percentage of average total net assets 0.16% 0.11% 0.16% 0.11%