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	$ 0	$ 204	$ 200,566	$ 343,142
Net (loss) income	0	0	0	0	0	4,433	4,433
Other comprehensive loss	0	0	0	0	(432)	0	(432)
Stock-based employee compensation expense	0	0	1,262	0	0	0	1,262
Issuance of restricted shares, net	1	0	(669)	0	0	0	(668)
Balances at Mar. 31, 2019	172	24	142,770	0	(228)	204,999	347,737
Balances at Dec. 31, 2018	171	24	142,177	0	204	200,566	343,142
Net (loss) income							10,504
Other comprehensive loss							(1,122)
Balances at Jun. 30, 2019	172	24	141,337	0	(918)	211,070	351,685
Balances at Mar. 31, 2019	172	24	142,770	0	(228)	204,999	347,737
Net (loss) income	0	0	0	0	0	6,071	6,071
Other comprehensive loss	0	0	0	0	(690)	0	(690)
Issuance of restricted shares, net	0	0	0	0	0	0	0
Stock-based employee compensation expense reversal	0	0	(1,433)	0	0	0	(1,433)
Balances at Jun. 30, 2019	172	24	141,337	0	(918)	211,070	351,685
Balances at Dec. 31, 2019	173	24	141,885	0	(1,014)	209,043	350,111
Net (loss) income	0	0	0	0	0	(2,213)	(2,213)
Other comprehensive loss	0	0	0	0	(2,350)	0	(2,350)
Share repurchase	0	0	0	(17,515)	0	0	(17,515)
Stock-based employee compensation expense	0	0	466	0	0	0	466
Issuance of restricted shares, net	0	0	(6)	0	0	0	(6)
Share repurchase	(0)	(0)	(0)	17,515	(0)	(0)	17,515
Balances at Mar. 31, 2020	173	24	142,345	(17,515)	(3,364)	206,830	328,493
Balances at Dec. 31, 2019	173	24	141,885	0	(1,014)	209,043	350,111
Net (loss) income							(24,556)
Other comprehensive loss							(1,950)
Balances at Jun. 30, 2020	173	24	142,657	(17,446)	(2,964)	184,487	306,931
Balances at Mar. 31, 2020	173	24	142,345	(17,515)	(3,364)	206,830	328,493
Net (loss) income	0	0	0	0	0	(22,343)	(22,343)
Other comprehensive loss	0	0	0	0	400	0	400
Share repurchase	0	0	0	(29)	0	0	(29)
Stock-based employee compensation expense	0	0	355	0	0	0	355
Issuance of restricted shares, net	0	0	(43)	40	0	0	(3)
Share repurchase	0	0	0	29	0	0	29
Balances at Jun. 30, 2020	$ 173	$ 24	$ 142,657	$ (17,446)	$ (2,964)	$ 184,487	$ 306,931