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Fair Value (Schedule Of Financial Assets And Liabilities At Fair Value) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments in U.S. Treasury notes held in equity trading accounts as collateral $ 12,619,922 $ 19,975,068
Investments in U.S. Treasury notes 90,620,937 113,585,567
Total investments in U.S. Treasury notes 103,240,859 133,560,635
Short-term Money Market Fund 9,342,913 13,861,142
Net unrealized appreciation on open futures and forward currency contracts 1,759,588 1,097,472
Net unrealized depreciation on open futures and forward currency contracts (2,436) (1,196,064)
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 1,757,152 (98,592)
Total financial assets at fair value 114,340,924 147,323,185
Futures Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 989,817 1,097,472
Energies [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 35,320 312,136
Grains [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 19,199 (187,779)
Interest Rates [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 683,654 394,563
Livestock [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts (2,650) (140)
Metals [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 31,057 295,006
Softs [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 33,266 (3,723)
Stock Indices [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 189,971 287,409
Forward Currency Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 767,335 (1,196,064)
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments in U.S. Treasury notes 103,240,859 133,560,635
Short-term Money Market Fund 9,342,913 13,861,142
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 989,817 1,097,472
Total financial assets at fair value 113,573,589 148,519,249
Level 1 [Member] | Futures Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 989,817 1,097,472
Level 1 [Member] | Energies [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 35,320 312,136
Level 1 [Member] | Grains [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 19,199 (187,779)
Level 1 [Member] | Interest Rates [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 683,654 394,563
Level 1 [Member] | Livestock [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts (2,650) (140)
Level 1 [Member] | Metals [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 31,057 295,006
Level 1 [Member] | Softs [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 33,266 (3,723)
Level 1 [Member] | Stock Indices [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 189,971 287,409
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 767,335 (1,196,064)
Total financial assets at fair value 767,335 (1,196,064)
Level 2 [Member] | Forward Currency Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts $ 767,335 $ (1,196,064)