Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balances (in shares) at Dec. 31, 2019	5,817,000
Balances at Dec. 31, 2019	$ 10,753,000	$ 6,725,000	$ 8,555,000	$ 26,033,000	$ 5,778,000	$ 31,811,000
Stock-based compensation expense	$ 0	56,000	0	56,000	0	56,000
Restricted common shares returned to the plan (in shares)	(129,000)
Restricted common shares returned to the plan	$ 0	0	0	0	0	0
Cash distributions to non-controlling interests	0	0	0	0	(326,000)	(326,000)
Net income (loss)	$ 0	0	(135,000)	(135,000)	67,000	(68,000)
Balances (in shares) at Mar. 31, 2020	5,688,000
Balances at Mar. 31, 2020	$ 10,753,000	6,781,000	8,420,000	25,954,000	5,519,000	31,473,000
Balances (in shares) at Dec. 31, 2019	5,817,000
Balances at Dec. 31, 2019	$ 10,753,000	6,725,000	8,555,000	26,033,000	5,778,000	31,811,000
Net income (loss)						(721,000)
Balances (in shares) at Sep. 30, 2020	5,751,000
Balances at Sep. 30, 2020	$ 10,753,000	6,914,000	7,728,000	25,395,000	5,319,000	30,714,000
Balances (in shares) at Mar. 31, 2020	5,688,000
Balances at Mar. 31, 2020	$ 10,753,000	6,781,000	8,420,000	25,954,000	5,519,000	31,473,000
Stock-based compensation expense	0	53,000	0	53,000	0	53,000
Cash distributions to non-controlling interests	0	0	0	0	(114,000)	(114,000)
Net income (loss)	$ 0	0	(483,000)	(483,000)	44,000	(439,000)
Stock-based compensation expense (in shares)	3,000
Balances (in shares) at Jun. 30, 2020	5,691,000
Balances at Jun. 30, 2020	$ 10,753,000	6,834,000	7,937,000	25,524,000	5,449,000	30,973,000
Stock-based compensation expense	0	80,000	0	80,000	0	80,000
Cash distributions to non-controlling interests	0	0	0	0	(142,000)	(142,000)
Net income (loss)	0	0	(209,000)	(209,000)	(5,000)	(214,000)
NCI Investment in Acquisition	$ 0	0	0	0	17,000	17,000
Balances (in shares) at Sep. 30, 2020	5,751,000
Balances at Sep. 30, 2020	$ 10,753,000	6,914,000	7,728,000	25,395,000	5,319,000	$ 30,714,000
Balances (in shares) at Dec. 31, 2020	5,791,000					5,791,000
Balances at Dec. 31, 2020	$ 10,753,000	7,024,000	1,497,000	19,274,000	4,376,000	$ 23,650,000
Stock-based compensation expense	0	107,000	0	107,000	0	107,000
Net income (loss)	$ 0	0	29,000	29,000	58,000	87,000
Stock-based compensation expense (in shares)	10,000
Balances (in shares) at Mar. 31, 2021	5,801,000
Balances at Mar. 31, 2021	$ 10,753,000	7,131,000	1,526,000	19,410,000	4,434,000	$ 23,844,000
Balances (in shares) at Dec. 31, 2020	5,791,000					5,791,000
Balances at Dec. 31, 2020	$ 10,753,000	7,024,000	1,497,000	19,274,000	4,376,000	$ 23,650,000
Net income (loss)						$ 228,000
Options exercised (in shares)						22,000
Balances (in shares) at Sep. 30, 2021	5,868,000					5,868,000
Balances at Sep. 30, 2021	$ 10,758,000	7,336,000	1,472,000	19,566,000	4,387,000	$ 23,953,000
Balances (in shares) at Mar. 31, 2021	5,801,000
Balances at Mar. 31, 2021	$ 10,753,000	7,131,000	1,526,000	19,410,000	4,434,000	23,844,000
Stock-based compensation expense	0	96,000	0	96,000	0	96,000
Cash distributions to non-controlling interests	0	0	0	0	(204,000)	(204,000)
Net income (loss)	$ 0	0	(87,000)	(87,000)	60,000	(27,000)
Stock-based compensation expense (in shares)	62,000
Options exercised (in shares)	5,000
Options exercised	$ 5,000	0	0	5,000	0	5,000
Balances (in shares) at Jun. 30, 2021	5,868,000
Balances at Jun. 30, 2021	$ 10,758,000	7,227,000	1,439,000	19,424,000	4,290,000	23,714,000
Stock-based compensation expense	0	109,000	0	109,000	0	109,000
Cash distributions to non-controlling interests	0	0	0	0	(38,000)	(38,000)
Net income (loss)	$ 0	0	33,000	33,000	135,000	$ 168,000
Stock-based compensation expense (in shares)	0
Balances (in shares) at Sep. 30, 2021	5,868,000					5,868,000
Balances at Sep. 30, 2021	$ 10,758,000	$ 7,336,000	$ 1,472,000	$ 19,566,000	$ 4,387,000	$ 23,953,000