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, 2019	117,329	137
Balance at Dec. 31, 2019	$ 12	$ (685)	$ 224,091	$ (133,701)	$ 48,084	$ 49,814		$ 89,717
Share-based compensation	$ 0	$ 0	(1,600)	0	0	0		(1,600)
Restricted stock vesting (in shares)	70	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0		0
Shares repurchased related to share-based compensation (in shares)	(11)	11
Shares repurchased related to share-based compensation	$ 0	$ (57)	0	0	0	0		(57)
Preferred stock dividends	0	0	(3,443)	0				(3,443)
Preferred stock dividends					1,757	1,673		3,443
Deemed dividends - accretion of beneficial conversion feature	0	0	(76)	0	76	0		(76)
Net income (loss)	$ 0	$ 0	0	902	0	0		902
Balance (in shares) at Mar. 31, 2020	117,388	148
Balance at Mar. 31, 2020	$ 12	$ (742)	218,972	(132,799)	49,917	51,487		85,443
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	$ 0	$ 0	(3,414)	0	0	0	0	(3,414)
Restricted stock vesting (in shares)	134	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0	0	0
Shares repurchased related to share-based compensation (in shares)	(20)	20
Shares repurchased related to share-based compensation	$ 0	$ (44)	0	0	0	0	0	(44)
Stock dividend (in shares)	399	0
Stock dividend	$ 0	$ 0	0	0	0	0	0	0
Issuance of Series C Convertible Preferred Stock (in shares)	0	0
Issuance of Series C Convertible Preferred Stock	$ 0	$ 0	0	0	0	0	23,629	0
Preferred stock dividends	0	0	(3,875)	0				(3,875)
Preferred stock dividends					1,978	1,884	0	3,875
Deemed dividends - accretion of beneficial conversion feature	0	0	(16)	0	16	0	0	(16)
Net income (loss)	$ 0	$ 0	0	(3,658)	0	0	0	(3,658)
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