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CONTRACTS AND AGREEMENTS - Brokerage commission (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CONTRACTS AND AGREEMENTS      
Total commissions accrued to brokers $ 860,102 $ 807,322 $ 1,123,971
Commission      
CONTRACTS AND AGREEMENTS      
Total commissions accrued to brokers $ 860,102 $ 807,322 $ 1,123,971
Total commissions as annualized percentage of average total net assets 0.05% 0.03% 0.04%