CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 3 months ended Mar. 31, 2016 - 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, 2015	$ 43,642,000	$ 4,170,000	$ 12,884,000	$ 31,495,000	$ (4,566,000)	$ (341,000)
Balance (in shares) at Dec. 31, 2015		4,170,000			(554,000)
Net income	12,323,000	$ 0	0	12,323,000	$ 0	0
Exercise of stock options	23,000	$ 6,000	17,000	0	0	0
Exercise of stock options (in shares)		6,000
Purchase of Class A common stock	(255,000)	$ 0	0	0	$ (255,000)	0
Purchase of Class A common stock (in shares)					(30,000)
Restricted common stock compensation	14,000	0	14,000	0	$ 0	0
Stock-based compensation	(24,000)	0	(24,000)	0	0	0
Dividend	(1,976,000)	0	0	(1,976,000)	0	0
Foreign currency translation adjustment	(70,000)	0	0	0	0	(70,000)
Balance at Mar. 31, 2016	$ 53,677,000	$ 4,176,000	$ 12,891,000	$ 41,842,000	$ (4,821,000)	$ (411,000)
Balance (in shares) at Mar. 31, 2016		4,176,000			(584,000)