Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ 3,757	$ 123,468	$ 160,570	$ 688	$ (25,201)
Equity based compensation		(581)
Shares issued under employee benefit plans					169
Shares issued under employee benefit plans		(169)
Net income (loss)			(64,310)			$ (64,310)
Additional minimum pension liability, net of tax				27
Unrealized holding gains (losses) arising during period, net of tax				(5,520)
Reclassification adjustment for gains included in net income (loss), net of tax				(4,452)
Ending balance at Mar. 31, 2020	3,757	122,718	96,260	(9,257)	(25,032)	188,446
Balance at Dec. 31, 2020	3,757	122,893	68,915	383	(25,026)	170,922
Equity based compensation		97
Shares issued under employee benefit plans					265
Shares issued under employee benefit plans		(265)
Net income (loss)			9,345			9,345
Additional minimum pension liability, net of tax				34
Unrealized holding gains (losses) arising during period, net of tax				462
Reclassification adjustment for gains included in net income (loss), net of tax				(1,108)
Ending balance at Mar. 31, 2021	$ 3,757	$ 122,725	$ 78,260	$ (229)	$ (24,761)	$ 179,752