Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2016	$ 170	$ 24	$ 137,912	$ (1,084)	$ (2,640)	$ 102,032	$ 236,414
Net income						1,510	1,510
Other comprehensive loss					(1,157)		(1,157)
Stock-based employee compensation expense			354				354
Issuance of restricted shares			(1,038)	1,084			46
Balance at Jun. 30, 2017	$ 170	$ 24	$ 137,228		$ (3,797)	$ 103,542	$ 237,167