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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)
Total
USD ($)
Subtotal
Class A
USD ($)
Class B
USD ($)
General Partnership
USD ($)
Treasury Units
Balance at Dec. 31, 2010 $ (26,920,567)   $ (21,539,906) $ (5,111,628) $ (269,033)  
Balance (in units outstanding) at Dec. 31, 2010 131,484          
Balance (in units issued) at Dec. 31, 2010   180,225 144,180 34,243 1,802 48,741
Increase (Decrease) in Partners' Capital            
Distribution to Partners (1,840,784)   (1,472,626) (349,749) (18,408)  
Net Income 8,262,729   6,610,183 1,569,919 82,627  
Balance at Jun. 30, 2011 (20,498,621)   (16,402,349) (3,891,458) (204,814)  
Balance (in units outstanding) at Jun. 30, 2011 131,484          
Balance (in units issued) at Jun. 30, 2011   180,225 144,180 34,243 1,802 48,741
Balance at Dec. 31, 2011 (21,310,852)   (17,052,134) (4,045,783) (212,935)  
Balance (in units outstanding) at Dec. 31, 2011 131,484          
Balance (in units issued) at Dec. 31, 2011   180,225 144,180 34,243 1,802 48,741
Increase (Decrease) in Partners' Capital            
Distribution to Partners (1,971,688)   (1,577,350) (374,621) (19,717)  
Stock Buyback (69,379)   (55,778) (12,921) (680)  
Stock Buyback (in units) (86)         86
Net Income 1,674,214   1,339,371 318,101 16,742  
Balance at Jun. 30, 2012 $ (21,677,705)   $ (17,345,891) $ (4,115,224) $ (216,590)  
Balance (in units outstanding) at Jun. 30, 2012 131,398          
Balance (in units issued) at Jun. 30, 2012   180,225 144,180 34,243 1,802 48,827