CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 9 months ended Sep. 30, 2018 - USD ($)	Total	Common Class A [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive loss [Member]
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	911,000	$ 0	0	911,000	$ 0	0
Exercise of stock options	737,000	$ 184,000	553,000	0	0	0
Exercise of stock options (in shares)		184,000
Restricted common stock compensation	32,000	$ 7,000	25,000	0	0	0
Restricted common stock compensation (in shares)		7,000
Purchase of Class A common stock	(589,000)	$ 0	0	0	$ (589,000)	0
Purchase of Class A common stock (in shares)					(71,000)
Stock-based compensation	169,000	0	169,000	0	$ 0	0
Dividends	(544,000)	0	0	(544,000)	0	0
Foreign currency translation adjustment	(91,000)	0	0	0	0	(91,000)
Balance at Sep. 30, 2018	$ 46,638,000	$ 4,394,000	$ 13,811,000	$ 34,822,000	$ (5,768,000)	$ (621,000)
Balance (in shares) at Sep. 30, 2018		4,394,000			(702,000)