CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Partners' Capital
Balance			$ (41,469,045)	$ (37,823,787)
Balance (in units)			121,756	121,978
Distribution to Partners			$ (2,337,721)	$ (2,338,034)
Stock Buyback				$ (394,031)
Stock Buyback (in units)				(222)
Net income	$ 569,891	$ 1,465,051	275,711	$ 2,833,834
Balance	$ (43,531,055)	$ (37,722,018)	$ (43,531,055)	$ (37,722,018)
Balance (in units)	121,756	121,756	121,756	121,756
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			$ (413,280)	$ (376,827)
Balance (in units)			1,802	1,802
Distribution to Partners			$ (23,377)	$ (23,380)
Stock Buyback				(3,941)
Net income			2,757	28,338
Balance	$ (433,900)	$ (375,810)	$ (433,900)	$ (375,810)
Balance (in units)	1,802	1,802	1,802	1,802
Treasury Units
Increase (Decrease) in Partners' Capital
Balance (in units)			(58,469)	(58,247)
Stock Buyback (in units)				(222)
Balance (in units)	(58,469)	(58,469)	(58,469)	(58,469)
Class A
Increase (Decrease) in Partners' Capital
Balance			$ (33,203,447)	$ (30,287,245)
Balance (in units)			144,180	144,180
Distribution to Partners			$ (1,870,177)	$ (1,870,428)
Stock Buyback				(315,220)
Net income			220,569	2,267,068
Balance	$ (34,853,055)	$ (30,205,825)	$ (34,853,055)	$ (30,205,825)
Balance (in units)	144,180	144,180	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			$ (444,167)	$ (444,226)
Stock Buyback				(74,870)
Net income			52,385	538,428
Balance	$ (8,244,100)	$ (7,140,383)	$ (8,244,100)	$ (7,140,383)
Balance (in units)	34,243	34,243	34,243	34,243