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Fair Value (Schedule Of Financial Assets And Liabilities At Fair Value) (Details) - USD ($)
Mar. 31, 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 $ 9,255,178 $ 19,975,068
Investments in U.S. Treasury notes 101,617,614 113,585,567
Total investments in U.S. Treasury notes 110,872,792 133,560,635
Short-term Money Market Fund 8,903,666 13,861,142
Net unrealized appreciation on open futures and forward currency contracts 4,074,779 1,097,472
Net unrealized depreciation on open futures and forward currency contracts (147,737) (1,196,064)
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 3,927,042 (98,592)
Total financial assets at fair value 123,703,500 147,323,185
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 2,281,706 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 876,755 312,136
Grains [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 55,475 (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 604,490 394,563
Livestock [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 2,620 (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 355,483 295,006
Softs [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 70,581 (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 316,302 287,409
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 1,645,336 (1,196,064)
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments in U.S. Treasury notes 110,872,792 133,560,635
Short-term Money Market Fund 8,903,666 13,861,142
Total net unrealized appreciation (depreciation) on open futures and forward currency contracts 2,281,706 1,097,472
Total financial assets at fair value 122,058,164 148,519,249
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 2,281,706 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 876,755 312,136
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 55,475 (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 604,490 394,563
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 2,620 (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 355,483 295,006
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 70,581 (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 316,302 287,409
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 1,645,336 (1,196,064)
Total financial assets at fair value 1,645,336 (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 $ 1,645,336 $ (1,196,064)