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Fair Value (Schedule Of Financial Assets And Liabilities At Fair Value) (Details) - USD ($)
Jun. 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 $ 10,032,348 $ 19,975,068
Investments in U.S. Treasury notes 102,181,312 113,585,567
Total investments in U.S. Treasury notes 112,213,660 133,560,635
Short-term Money Market Fund 8,697,580 13,861,142
Net unrealized appreciation on open futures and forward currency contracts 854,982 1,097,472
Net unrealized depreciation on open futures and forward currency contracts (192,485) (1,196,064)
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 662,497 (98,592)
Total financial assets at fair value 121,573,737 147,323,185
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 854,982 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 (6,728) 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 129,266 (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 822,460 394,563
Livestock [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts (1,260) (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 (449,560) 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 (27,199) (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 388,003 287,409
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 (192,485) (1,196,064)
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments in U.S. Treasury notes 112,213,660 133,560,635
Short-term Money Market Fund 8,697,580 13,861,142
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 854,982 1,097,472
Total financial assets at fair value 121,766,222 148,519,249
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 854,982 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 (6,728) 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 129,266 (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 822,460 394,563
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 (1,260) (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 (449,560) 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 (27,199) (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 388,003 287,409
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 (192,485) (1,196,064)
Total financial assets at fair value (192,485) (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 $ (192,485) $ (1,196,064)