Consolidated Statement of Stockholders' Equity and Convertible Preferred Stock (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Series C Convertible Preferred Stock [Member]	Total
Balance (in shares) at Dec. 31, 2020	117,829	249
Balance at Dec. 31, 2020	$ 12	$ (1,031)	$ 209,481	$ (148,030)	$ 55,522	$ 56,781	$ 0	$ 60,432
Share-based compensation			(3,414)					(3,414)
Restricted stock vesting (in shares)	134
Shares repurchased related to share-based compensation (in shares)	(20)	20
Shares repurchased related to share-based compensation		$ (44)						(44)
Issuance of Series C Convertible Preferred Stock							23,629
Preferred stock dividends			(3,875)		1,978	1,884	0	(3,875)
Net loss	$ 0	$ 0	0	(3,658)	0	0	0	(3,658)
Stock dividend (in shares)	399	0
Deemed dividends - accretion of beneficial conversion feature	$ 0	$ 0	(16)	0	16	0	0	(16)
Balance (in shares) at Mar. 31, 2021	118,342	269
Balance at Mar. 31, 2021	$ 12	$ (1,075)	202,176	(151,688)	57,516	58,665	23,629	49,425
Balance (in shares) at Dec. 31, 2021	120,838	346
Balance at Dec. 31, 2021	$ 12	$ (1,315)	191,264	(170,069)	63,791	64,602	40,007	19,892
Share-based compensation			(2,372)					(2,372)
Restricted stock vesting (in shares)	911
Shares repurchased related to share-based compensation (in shares)	(195)	195
Shares repurchased related to share-based compensation		$ (464)						(464)
Issuance of Series C Convertible Preferred Stock							9,806
Preferred stock dividends			(5,754)		2,225	2,123	1,387	(5,754)
Net loss	$ 0	$ 0	0	(11,437)	0	0	0	(11,437)
Balance (in shares) at Mar. 31, 2022	121,554	541
Balance at Mar. 31, 2022	$ 12	$ (1,779)	$ 183,138	$ (181,506)	$ 66,016	$ 66,725	$ 51,200	$ (135)