Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	13,169,204	0
Balance at Dec. 31, 2020	$ 13	$ 0	$ 366,087	$ (349,765)	$ 16,335
Share-based compensation	$ 0	$ 0	499	0	499
Issuance of restricted stock (in shares)	220,000	0
Net income (loss)	$ 0	$ 0	0	310	$ 310
Issuance of common stock upon exercise of stock options (in shares)	54,705	0			54,705
Issuance of common stock upon exercise of stock options	$ 0	$ 0	126	0	$ 126
Balance (in shares) at Mar. 31, 2021	13,443,909	0
Balance at Mar. 31, 2021	$ 13	$ 0	366,712	(349,455)	17,270
Balance (in shares) at Dec. 31, 2021	13,489,482	0
Balance at Dec. 31, 2021	$ 13	$ 0	368,168	(355,424)	12,757
Share-based compensation	$ 0	$ 0	515	0	515
Issuance of restricted stock (in shares)	575,000	0
Issuance of restricted stock	$ 1	$ 0	0	0	1
Cancellation of restricted stock (in shares)	(13,333)	0
Net income (loss)	$ 0	$ 0	0	(4,307)	$ (4,307)
Issuance of common stock upon exercise of stock options (in shares)					0
Balance (in shares) at Mar. 31, 2022	14,051,149	0
Balance at Mar. 31, 2022	$ 14	$ 0	$ 368,683	$ (359,731)	$ 8,966