CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($)	Subtotal	General Partnership	Treasury Units	Class A	Class B	Total
Balance at Dec. 31, 2015		$ (306,870)		$ (24,673,535)	$ (5,830,548)	$ (30,810,953)
Balance (in units) at Dec. 31, 2015	180,225	1,802	(54,851)	144,180	34,243	125,374
Increase (Decrease) in Partners' Capital
Distribution to Partners		$ (18,738)		$ (1,499,080)	$ (356,032)	$ (1,873,850)
Stock Buyback		(6,783)		(558,723)	(128,874)	$ (694,380)
Stock Buyback (in units)			(451)			(451)
Net income		22,113		1,769,081	420,157	$ 2,211,351
Balance at Jun. 30, 2016		$ (310,278)		$ (24,962,257)	$ (5,895,297)	$ (31,167,832)
Balance (in units) at Jun. 30, 2016	180,225	1,802	(55,302)	144,180	34,243	124,923
Balance at Dec. 31, 2016		$ (340,840)		$ (27,407,924)	$ (6,475,961)	$ (34,224,726)
Balance (in units) at Dec. 31, 2016	180,225	1,802	(55,816)	144,180	34,243	124,409
Increase (Decrease) in Partners' Capital
Distribution to Partners		$ (22,392)		$ (1,791,334)	$ (425,442)	$ (2,239,168)
Stock Buyback		(426)		(34,038)	(8,084)	$ (42,548)
Stock Buyback (in units)			(23)			(23)
Net income		43,779		3,502,353	831,809	$ 4,377,941
Balance at Jun. 30, 2017		$ (319,879)		$ (25,730,943)	$ (6,077,678)	$ (32,128,500)
Balance (in units) at Jun. 30, 2017	180,225	1,802	(55,839)	144,180	34,243	124,386