CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($)	3 Months Ended				12 Months Ended			172 Months Ended
	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Increase (Decrease) in Partners' Capital
Balance		$ (41,469,045)		$ (37,823,788)	$ (41,469,045)	$ (37,823,788)	$ (35,624,010)
Balance (in units)		121,756		121,978	121,756	121,978	124,386
Distribution to Partners					$ (4,673,140)	$ (4,675,754)	$ (4,696,893)
Stock Buyback					$ (450,258)	$ (394,031)	$ (4,050,137)	$ (45,168,000)
Stock Buyback (in units)					(240)	(222)	(2,408)
Net income	$ (2,900,489)	$ (294,180)	$ (970,022)	$ 1,368,783	$ (2,700,163)	$ 1,424,528	$ 6,547,252
Balance	$ (49,292,607)		$ (41,469,045)		$ (49,292,607)	$ (41,469,045)	$ (37,823,788)	$ (49,292,607)
Balance (in units)	121,516		121,756		121,516	121,756	121,978	121,516
Subtotal
Increase (Decrease) in Partners' Capital
Balance (in units)		180,225		180,225	180,225	180,225	180,225
Balance (in units)	180,225		180,225		180,225	180,225	180,225	180,225
General Partnership
Increase (Decrease) in Partners' Capital
Balance		$ (413,280)		$ (376,827)	$ (413,280)	$ (376,827)	$ (354,833)
Balance (in units)		1,802		1,802	1,802	1,802	1,802
Distribution to Partners					$ (46,731)	$ (46,757)	$ (46,969)
Stock Buyback					$ (4,500)	(3,941)	(40,498)
Stock Buyback (in units)					(2.40)
Net income					$ (27,002)	14,245	65,473
Balance	$ (491,512)		$ (413,280)		$ (491,512)	$ (413,280)	$ (376,827)	$ (491,512)
Balance (in units)	1,802		1,802		1,802	1,802	1,802	1,802
Treasury Units
Increase (Decrease) in Partners' Capital
Balance (in units)		58,469		58,247	58,469	58,247	55,839
Stock Buyback (in units)					(240)	(222)	(2,408)
Balance (in units)	58,709		58,469		58,709	58,469	58,247	58,709
Class A
Increase (Decrease) in Partners' Capital
Balance		$ (33,203,447)		$ (30,287,245)	$ (33,203,447)	$ (30,287,245)	$ (28,527,352)
Balance (in units)		144,180		144,180	144,180	144,180	144,180
Distribution to Partners					$ (3,738,512)	$ (3,740,604)	$ (3,757,514)
Stock Buyback					(360,266)	(315,220)	(3,240,181)
Net income					(2,160,131)	1,139,622	5,237,802
Balance	$ (39,462,357)		$ (33,203,447)		$ (39,462,357)	$ (33,203,447)	$ (30,287,245)	$ (39,462,357)
Balance (in units)	144,180		144,180		144,180	144,180	144,180	144,180
Class B
Increase (Decrease) in Partners' Capital
Balance		$ (7,852,318)		$ (7,159,715)	$ (7,852,318)	$ (7,159,715)	$ (6,741,825)
Balance (in units)		34,243		34,243	34,243	34,243	34,243
Distribution to Partners					$ (887,897)	$ (888,393)	$ (892,410)
Stock Buyback					$ (85,492)	(74,870)	(769,458)
Stock Buyback (in units)					(45.54)
Net income					$ (513,031)	270,660	1,243,978
Balance	$ (9,338,738)		$ (7,852,318)		$ (9,338,738)	$ (7,852,318)	$ (7,159,715)	$ (9,338,738)
Balance (in units)	34,243		34,243		34,243	34,243	34,243	34,243