CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Class A [Member] Common Stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive loss [Member]	Total
Balance at Dec. 31, 2019	$ 4,416,000	$ 14,056,000	$ 38,867,000	$ (10,213,000)	$ (620,000)	$ 46,506,000
Balance (in shares) at Dec. 31, 2019	4,416,000			(1,273,000)
Net (loss) income	$ 0	0	(3,996,000)	$ 0	0	(3,996,000)
Exercise of stock options	$ 1,000	2,000				3,000
Exercise of stock options (in shares)	1,000
Restricted common stock compensation	$ 6,000	27,000	0	0	0	33,000
Restricted common stock compensation (in shares)	6,000
Stock-based compensation	$ 0	39,000	0	0	0	39,000
Dividends	0	0	(157,000)	0	0	(157,000)
Foreign currency translation adjustment	0	0	0	0	(60,000)	(60,000)
Balance at Sep. 30, 2020	$ 4,423,000	14,124,000	34,714,000	$ (10,213,000)	(680,000)	42,368,000
Balance (in shares) at Sep. 30, 2020	4,423,000			(1,273,000)
Balance at Jun. 30, 2020	$ 4,423,000	14,106,000	35,571,000	$ (10,213,000)	(757,000)	43,130,000
Balance (in shares) at Jun. 30, 2020	4,423,000			(1,273,000)
Net (loss) income	$ 0	0	(857,000)	$ 0	0	(857,000)
Restricted common stock compensation	$ 0	8,000	0	0	0	8,000
Restricted common stock compensation (in shares)	0
Stock-based compensation	$ 0	10,000	0	0	0	10,000
Foreign currency translation adjustment	0	0	0	0	77,000	77,000
Balance at Sep. 30, 2020	$ 4,423,000	14,124,000	34,714,000	$ (10,213,000)	(680,000)	42,368,000
Balance (in shares) at Sep. 30, 2020	4,423,000			(1,273,000)
Balance at Dec. 31, 2020	$ 4,428,000	14,144,000	33,756,000	$ (10,213,000)	(577,000)	41,538,000
Balance (in shares) at Dec. 31, 2020	4,428,000			(1,273,000)
Net (loss) income	$ 0	0	1,383,000	$ 0	0	1,383,000
Restricted common stock compensation	$ 25,000	10,000	0	$ 0	0	35,000
Restricted common stock compensation (in shares)	25,000			0
Stock-based compensation	$ 0	4,000	0	$ 0	0	4,000
Foreign currency translation adjustment	0	0	0	0	(42,000)	(42,000)
Balance at Sep. 30, 2021	$ 4,453,000	14,158,000	35,139,000	$ (10,213,000)	(619,000)	42,918,000
Balance (in shares) at Sep. 30, 2021	4,453,000			(1,273,000)
Balance at Jun. 30, 2021	$ 4,453,000	14,149,000	35,872,000	$ (10,213,000)	(558,000)	43,703,000
Balance (in shares) at Jun. 30, 2021	4,453,000			(1,273,000)
Net (loss) income	$ 0	0	(733,000)	$ 0	0	(733,000)
Restricted common stock compensation	$ 0	8,000	0	0	0	8,000
Restricted common stock compensation (in shares)	0
Stock-based compensation	$ 0	1,000	0	0	0	1,000
Foreign currency translation adjustment	0	0	0	0	(61,000)	(61,000)
Balance at Sep. 30, 2021	$ 4,453,000	$ 14,158,000	$ 35,139,000	$ (10,213,000)	$ (619,000)	$ 42,918,000
Balance (in shares) at Sep. 30, 2021	4,453,000			(1,273,000)