CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CCONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Revenue	$ 662,000	$ 658,000	$ 2,005,000	$ 2,324,000
Costs and expenses:
Patient expenses	81,000	79,000	276,000	249,000
Selling, general and administrative	297,000	287,000	941,000	960,000
Total	378,000	366,000	1,217,000	1,209,000
Operating income	284,000	292,000	788,000	1,115,000
Interest expense	(5,000)	(21,000)	(24,000)	(75,000)
Interest income - sales-type sublease	16,000	31,000	60,000	104,000
Loss from investments in unconsolidated entities, net	(56,000)	(135,000)	(292,000)	(799,000)
Income before income taxes	239,000	167,000	532,000	345,000
Provision for income taxes	(75,000)	(52,000)	(148,000)	(103,000)
Net income	$ 164,000	$ 115,000	$ 384,000	$ 242,000
Basic and diluted net income per share (in dollars per share)	$ 0.02	$ 0.01	$ 0.05	$ 0.03
Weighted average common shares outstanding (in shares)	7,792,185	7,792,185	7,792,185	7,792,185