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, 2008	$ (17,717,182)		$ (14,173,745)	$ (3,366,265)	$ (177,172)
Balance (in units outstanding) at Dec. 31, 2008	135,251
Balance (in units issued) at Dec. 31, 2008		180,225	144,180	34,243	1,802	44,974
Increase (Decrease) in Partners' Capital
Distribution to Partners	3,713,840		(2,971,072)	(705,630)	(37,138)
Stock Buyback	1,514,340		(1,214,734)	(284,262)	(14,980)
Stock Buyback (in units)	(2,905)					2,905
Net Income (Loss)	1,612,538		1,290,030	306,382	16,125
Balance at Dec. 31, 2009	(21,332,824)		(17,069,520)	(4,050,138)	(213,165)
Balance (in units outstanding) at Dec. 31, 2009	132,346
Balance (in units issued) at Dec. 31, 2009		180,225	144,180	34,243	1,802	47,879
Increase (Decrease) in Partners' Capital
Distribution to Partners	3,687,600		(2,950,080)	(700,644)	(36,876)
Stock Buyback	540,911		(432,920)	(102,591)	(5,400)
Stock Buyback (in units)	(862)					862
Net Income (Loss)	(1,359,232)		(1,087,386)	(258,254)	(13,592)
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	3,681,566		(2,945,253)	(699,498)	(36,815)
Net Income (Loss)	9,291,281		7,433,025	1,765,343	92,913
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