CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($)	3 Months Ended		6 Months Ended		142 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Increase (Decrease) in Partners' Capital
Balance			$ (35,624,010)	$ (35,315,177)
Balance (in units)			124,386	124,386
Distribution to Partners			$ (2,352,443)	$ (2,238,962)
Stock Buyback			$ (3,305,651)		$ (43,579,000)
Stock Buyback (in units)			(1,995)
Net income	$ 1,764,244	$ 53,326	$ 3,264,760	1,931,883
Balance	$ (38,017,344)	$ (35,622,256)	$ (38,017,344)	$ (35,622,256)	$ (38,017,344)
Balance (in units)	122,391	124,386	122,391	124,386	122,391
Subtotal
Increase (Decrease) in Partners' Capital
Balance (in units)			180,225	180,225
Balance (in units)	180,225	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			$ (23,524)	$ (22,390)
Stock Buyback			$ (33,055)
Stock Buyback (in units)			(20)
Net income			$ 32,648	19,319
Balance	$ (378,764)	$ (354,816)	$ (378,764)	$ (354,816)	$ (378,764)
Balance (in units)	1,802	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)			(1,995)
Balance (in units)	(57,834)	(55,839)	(57,834)	(55,839)	(57,834)
Class A
Increase (Decrease) in Partners' Capital
Balance			$ (28,527,352)	$ (28,280,285)
Balance (in units)			144,180	144,180
Distribution to Partners			$ (1,881,955)	$ (1,791,169)
Stock Buyback			(2,644,552)
Net income			2,611,808	1,545,506
Balance	$ (30,442,051)	$ (28,525,948)	$ (30,442,051)	$ (28,525,948)	$ (30,442,051)
Balance (in units)	144,180	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			$ (446,964)	$ (425,403)
Stock Buyback			(628,044)
Net income			620,304	367,058
Balance	$ (7,196,529)	$ (6,741,492)	$ (7,196,529)	$ (6,741,492)	$ (7,196,529)
Balance (in units)	34,243	34,243	34,243	34,243	34,243