Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 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
Balances at Dec. 31, 2018	$ 171	$ 24	$ 142,177		$ 204	$ 200,566	$ 343,142
Net (loss) income						4,433	4,433
Other comprehensive income					(432)		(432)
Stock-based employee compensation expense			1,262				1,262
Issuance of restricted shares, net	1		(669)				(668)
Balances at Mar. 31, 2019	172	24	142,770		(228)	204,999	347,737
Balances at Dec. 31, 2019	173	24	141,885		(1,014)	209,043	350,111
Net (loss) income						(2,213)	(2,213)
Other comprehensive income					(2,350)		(2,350)
Share repurchase				(17,515)			(17,515)
Stock-based employee compensation expense			466				466
Issuance of restricted shares, net			(6)				(6)
Balances at Mar. 31, 2020	$ 173	$ 24	$ 142,345	$ (17,515)	$ (3,364)	$ 206,830	$ 328,493