CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital in Excess of Par Value	(Accumulated Deficit) Retained Earnings
Beginning Balance at Dec. 31, 2019	$ (102,490)	$ 944	$ (103,434)
Beginning Balance (in shares) at Dec. 31, 2019		94,447,356
Common stock awards under incentive plans	375		375
Common stock awards under incentive plans (in shares)		29,746
Net income (loss)	9,003			$ 9,003
Ending Balance at Mar. 31, 2020	(93,112)	$ 944	(103,059)	9,003
Ending Balance (in shares) at Mar. 31, 2020		94,477,102
Beginning Balance at Dec. 31, 2020	(92,413)	$ 1,178	(85,232)	(8,359)
Beginning Balance (in shares) at Dec. 31, 2020		117,871,141
Common stock awards under incentive plans	505	$ 1	504
Common stock awards under incentive plans (in shares)		46,875
Net income (loss)	(4,624)			(4,624)
Ending Balance at Mar. 31, 2021	$ (96,532)	$ 1,179	$ (84,728)	$ (12,983)
Ending Balance (in shares) at Mar. 31, 2021		117,918,016