CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Total	Common Class A [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive (loss) income [Member]
Balance at Dec. 31, 2016	$ 47,590,000	$ 4,181,000	$ 12,906,000	$ 36,061,000	$ (4,821,000)	$ (737,000)
Balance (in shares) at Dec. 31, 2016		4,181,000			(584,000)
Net income (loss)	(884,000)	$ 0	0	(884,000)	$ 0	0
Exercise of stock options	62,000	$ 17,000	45,000	0	0	0
Exercise of stock options (in shares)		17,000
Restricted Common Stock compensation	38,000	$ 5,000	33,000	0	0	0
Restricted Common Stock compensation (in shares)		5,000
Stock - based compensation	80,000	$ 0	80,000	0	0	0
Purchase of Class A Common Stock	(358,000)	$ 0	0	0	$ (358,000)	0
Purchase of Class A Common Stock (in shares)		0			(47,000)
Dividends	(722,000)	$ 0	0	(722,000)	$ 0	0
Foreign currency translation adjustment	207,000	0	0	0	0	207,000
Balance at Dec. 31, 2017	46,013,000	$ 4,203,000	13,064,000	34,455,000	$ (5,179,000)	(530,000)
Balance (in shares) at Dec. 31, 2017		4,203,000			(631,000)
Net income (loss)	856,000	$ 0	0	856,000	$ 0	0
Exercise of stock options	806,000	$ 200,000	606,000	0	0	0
Exercise of stock options (in shares)		200,000
Restricted Common Stock compensation	45,000	$ 7,000	38,000	0	0	0
Restricted Common Stock compensation (in shares)		7,000
Stock - based compensation	196,000	$ 0	196,000	0	0	0
Purchase of Class A Common Stock	(1,516,000)	$ 0	0	0	$ (1,516,000)	0
Purchase of Class A Common Stock (in shares)		0			(185,000)
Dividends	(723,000)	$ 0	0	(723,000)	$ 0	0
Foreign currency translation adjustment	(142,000)	0	0	0	0	(142,000)
Balance at Dec. 31, 2018	$ 45,535,000	$ 4,410,000	$ 13,904,000	$ 34,588,000	$ (6,695,000)	$ (672,000)
Balance (in shares) at Dec. 31, 2018		4,410,000			(816,000)