Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ 131,647	$ (2,281)	$ 179,321	$ (335)	$ 308,352
Net income (loss)	0	0	(5,861)	0	(5,861)
Payment of dividends	0	0	(442)	0	(442)
Stock-based compensation	636	0	0	0	636
Changes in fair value of hedges, net of tax	0	(2,603)	0	0	(2,603)
Other	0	(1)	2	0	1
Restricted stock units converted to stock	(480)	0	0	480	0
Repurchase of common stock	0	0	0	(145)	(145)
Balance at Jun. 30, 2020	131,803	(4,885)	173,020	0	299,938
Balance at Mar. 31, 2020	132,006	(4,829)	179,695	(480)	306,392
Net income (loss)	0	0	(6,454)	0	(6,454)
Payment of dividends	0	0	(222)	0	(222)
Stock-based compensation	277	0	0	0	277
Changes in fair value of hedges, net of tax	0	(55)	0	0	(55)
Other	0	(1)	1	0	0
Restricted stock units converted to stock	(480)	0	0	480	0
Balance at Jun. 30, 2020	131,803	(4,885)	173,020	$ 0	299,938
Balance at Dec. 31, 2020	132,382	(4,215)	172,843		301,010
Net income (loss)	0	0	51,657		51,657
Payment of dividends	0	0	(443)		(443)
Stock-based compensation	534	0	0		534
Changes in fair value of hedges, net of tax	0	1,063	0		1,063
Other	0	(1)	0		(1)
Balance at Jun. 30, 2021	132,916	(3,153)	224,057		353,820
Balance at Mar. 31, 2021	132,644	(3,499)	194,630		323,775
Net income (loss)	0	0	29,649		29,649
Payment of dividends	0	0	(222)		(222)
Stock-based compensation	272	0	0		272
Changes in fair value of hedges, net of tax	0	347	0		347
Other	0	(1)	0		(1)
Balance at Jun. 30, 2021	$ 132,916	$ (3,153)	$ 224,057		$ 353,820