CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 164,000	$ 115,000	$ 384,000	$ 242,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of operating lease right-of-use asset			25,000	25,000
Loss from investments in unconsolidated entities, net			292,000	740,000
Distributed earnings from unconsolidated entities			63,000	0
Deferred income taxes			(109,000)	(135,000)
Changes in:
Accounts receivable			11,000	95,000
Income taxes receivable/payable			(148,000)	95,000
Other current assets			8,000	105,000
Accounts payable and accrued expenses			(47,000)	(7,000)
Deferred revenue			69,000	(53,000)
Operating lease right-of-use liability			(26,000)	(26,000)
Net cash provided by operating activities			522,000	1,081,000
Cash flows from investing activities:
Advances to unconsolidated entities			(337,000)	(1,221,000)
Repayments from loans to unconsolidated entities			170,000	431,000
Capital contributions to unconsolidated entities			(36,000)	0
Principal payments received under sales-type sublease			660,000	616,000
Net cash provided by (used in) investing activities			457,000	(174,000)
Cash flows from financing activities:
Repayment of finance lease obligations			(814,000)	(1,034,000)
Net cash used in financing activities			(814,000)	(1,034,000)
Net change in cash and cash equivalents			165,000	(127,000)
Cash and cash equivalents - beginning of period			1,335,000	1,519,000	$ 1,519,000
Cash and cash equivalents - end of period	$ 1,500,000	$ 1,392,000	1,500,000	1,392,000	$ 1,335,000
Cash paid for:
Interest			22,000	78,000
Income taxes			407,000	140,000
Supplemental disclosure of noncash investing and financing activities:
Recognition of a right-of-use asset			0	161,000
Recognition of a right-of-use liability			0	176,000
Derecognition of deferred rent liability (previously included in accounts payable and accrued expenses)			$ 0	$ 15,000