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	(1,235)	0	0	0		(1,235)
Restricted stock vesting (in shares)	204	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0		0
Shares repurchased related to share-based compensation (in shares)	(41)	41
Shares repurchased related to share-based compensation	$ 0	$ (111)	0	0	0	0		(111)
Preferred stock dividends	0	0	(6,952)	0				(6,952)
Preferred stock dividends					3,546	3,378		6,952
Deemed dividends - accretion of beneficial conversion feature	0	0	(97)	0	97	0		(97)
Net loss	$ 0	$ 0	0	(4,872)	0	0		(4,872)
Balance (in shares) at Jun. 30, 2020	117,492	178
Balance at Jun. 30, 2020	$ 12	$ (796)	215,807	(138,573)	51,727	53,192		76,450
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
Share-based compensation	$ 0	$ 0	365	0	0	0		365
Restricted stock vesting (in shares)	134	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0		0
Shares repurchased related to share-based compensation (in shares)	(30)	30
Shares repurchased related to share-based compensation	$ 0	$ (54)	0	0	0	0		(54)
Preferred stock dividends	0	0	(3,509)	0				(3,509)
Preferred stock dividends					1,789	1,705		3,509
Deemed dividends - accretion of beneficial conversion feature	0	0	(21)	0	21	0		(21)
Net loss	$ 0	$ 0	0	(5,774)	0	0		(5,774)
Balance (in shares) at Jun. 30, 2020	117,492	178
Balance at Jun. 30, 2020	$ 12	$ (796)	215,807	(138,573)	51,727	53,192		76,450
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	(2,146)	0	0	0	0	(2,146)
Restricted stock vesting (in shares)	305	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0	0	0
Shares repurchased related to share-based compensation (in shares)	(51)	51
Shares repurchased related to share-based compensation	$ 0	$ (140)	0	0	0	0	0	(140)
Issuance of Series C Convertible Preferred Stock	0	0	0	0	0	0	33,173	0
Preferred stock dividends	0	0	(7,751)	0				(7,751)
Preferred stock dividends					3,956	3,768	0	7,751
Deemed dividends - accretion of beneficial conversion feature	0	0	(31)	0	31	0	0	(31)
Net loss	$ 0	$ 0	0	(15,238)	0	0	0	(15,238)
Stock dividend (in shares)	399	0
Stock dividend	$ 0	$ 0	0	0	0	0	0	0
Balance (in shares) at Jun. 30, 2021	118,482	300
Balance at Jun. 30, 2021	$ 12	$ (1,171)	199,553	(163,268)	59,509	60,549	33,173	35,126
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
Share-based compensation	$ 0	$ 0	1,268	0	0	0	0	1,268
Restricted stock vesting (in shares)	171	0
Restricted stock vesting	$ 0	$ 0	0	0	0	0	0	0
Shares repurchased related to share-based compensation (in shares)	(31)	31
Shares repurchased related to share-based compensation	$ 0	$ (96)	0	0	0	0	0	(96)
Issuance of Series C Convertible Preferred Stock (in shares)	0	0
Issuance of Series C Convertible Preferred Stock	$ 0	$ 0	0	0	0	0	9,544	0
Preferred stock dividends	0	0	(3,876)	0				(3,876)
Preferred stock dividends					1,978	1,884	0	3,876
Deemed dividends - accretion of beneficial conversion feature	0	0	(15)	0	15	0	0	(15)
Net loss	$ 0	$ 0	0	(11,580)	0	0	0	(11,580)
Balance (in shares) at Jun. 30, 2021	118,482	300
Balance at Jun. 30, 2021	$ 12	$ (1,171)	$ 199,553	$ (163,268)	$ 59,509	$ 60,549	$ 33,173	$ 35,126