CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Partners' Capital
Balance	$ (41,469,045)	$ (37,823,787)
Balance (in units)	121,756	121,978
Distribution to Partners	$ (1,168,860)	$ (1,169,173)
Stock Buyback		$ (389,947)
Stock Buyback (in units)		(219)
Net income	(294,180)	$ 1,368,783
Balance	$ (42,932,085)	$ (38,014,124)
Balance (in units)	121,756	121,759
Subtotal
Increase (Decrease) in Partners' Capital
Balance (in units)	180,225	180,225
Balance (in units)	180,225	180,225
General Partnership
Increase (Decrease) in Partners' Capital
Balance	$ (413,280)	$ (376,827)
Balance (in units)	1,802	1,802
Distribution to Partners	$ (11,689)	$ (11,692)
Stock Buyback		(311,952)
Net income	(2,942)	13,688
Balance	$ (427,911)	$ (686,783)
Balance (in units)	1,802	1,802
Treasury Units
Increase (Decrease) in Partners' Capital
Balance (in units)	(58,469)	(58,247)
Stock Buyback (in units)		(219)
Balance (in units)	(58,469)	(58,466)
Class A
Increase (Decrease) in Partners' Capital
Balance	$ (33,203,447)	$ (30,287,245)
Balance (in units)	144,180	144,180
Distribution to Partners	$ (935,088)	$ (935,338)
Stock Buyback		(74,095)
Net income	(235,344)	1,095,026
Balance	$ (34,373,879)	$ (30,201,652)
Balance (in units)	144,180	144,180
Class B
Increase (Decrease) in Partners' Capital
Balance	$ (7,852,318)	$ (7,159,715)
Balance (in units)	34,243	34,243
Distribution to Partners	$ (222,083)	$ (222,143)
Stock Buyback		(3,900)
Net income	(55,894)	260,069
Balance	$ (8,130,295)	$ (7,125,689)
Balance (in units)	34,243	34,243