CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Partners' Capital
Balance			$ (35,624,010)	$ (35,315,177)
Balance (in units)			124,386	124,386
Distribution to Partners			$ (3,525,701)	$ (3,358,443)
Stock Buyback			$ (3,680,570)
Stock Buyback (in units)			(2,205)
Net income	$ 1,383,979	$ 660,329	$ 4,648,739	2,592,212
Balance	$ (38,181,542)	$ (36,081,408)	$ (38,181,542)	$ (36,081,408)
Balance (in units)	122,181	124,386	122,181	124,386
Subtotal
Increase (Decrease) in Partners' Capital
Balance (in units)			180,225	180,225
Balance (in units)	180,225	180,225	180,225	180,225
General Partnership
Increase (Decrease) in Partners' Capital
Balance			$ (354,833)	$ (351,745)
Balance (in units)			1,802	1,802
Distribution to Partners			$ (35,257)	$ (33,584)
Stock Buyback			(36,803)
Net income			46,487	25,922
Balance	$ (380,406)	$ (359,407)	$ (380,406)	$ (359,407)
Balance (in units)	1,802	1,802	1,802	1,802
Treasury Units
Increase (Decrease) in Partners' Capital
Balance (in units)			(55,839)	(55,839)
Stock Buyback (in units)			(2,205)
Balance (in units)	(58,044)	(55,839)	(58,044)	(55,839)
Class A
Increase (Decrease) in Partners' Capital
Balance			$ (28,527,352)	$ (28,280,285)
Balance (in units)			144,180	144,180
Distribution to Partners			$ (2,820,561)	$ (2,686,755)
Stock Buyback			(2,944,508)
Net income			3,718,992	2,073,770
Balance	$ (30,573,429)	$ (28,893,270)	$ (30,573,429)	$ (28,893,270)
Balance (in units)	144,180	144,180	144,180	144,180
Class B
Increase (Decrease) in Partners' Capital
Balance			$ (6,741,825)	$ (6,683,147)
Balance (in units)			34,243	34,243
Distribution to Partners			$ (669,883)	$ (638,104)
Stock Buyback			(699,259)
Net income			883,260	492,520
Balance	$ (7,227,707)	$ (6,828,731)	$ (7,227,707)	$ (6,828,731)
Balance (in units)	34,243	34,243	34,243	34,243