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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Per Share Operating Performance:      
Net asset value, beginning of year [1],[3] $ 23.34 [2] $ 37.18 $ 34.76
Total income (loss) 1.30 (13.49) [1] 2.77 [1]
Total expenses (0.29) (0.35) [1] (0.35) [1]
Net increase (decrease) in net asset value 1.01 (13.84) [1] 2.42 [1]
Net asset value, end of year $ 24.35 $ 23.34 [1],[2],[3] $ 37.18 [1],[3]
Total Return 4.33% (37.22%) 6.90%
Ratios to Average Net Assets      
Total income (loss) 30.51% (37.75%) 19.27%
Management fees 0.60% 0.60% 0.60%
Expenses excluding management fees [1] 0.68% 0.70% 0.52%
Net income (loss) 29.23% (39.05%) 18.15%
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.
[2] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.
[3] On January 4, 2018, there was a 1-for-4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.