Consolidated Statements of Shareholders' Deficit - USD ($)	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Common Stock [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Treasury Stock [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Additional Paid-in Capital [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] AOCI Attributable to Parent [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member] Retained Earnings [Member]	Conversion of Series A Preferred Stock to Series A1 Preferred Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Common Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Treasury Stock [Member]	Conversion of Series A Preferred to Common Stock [Member] Additional Paid-in Capital [Member]	Conversion of Series A Preferred to Common Stock [Member] AOCI Attributable to Parent [Member]	Conversion of Series A Preferred to Common Stock [Member] Retained Earnings [Member]	Conversion of Series A Preferred to Common Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Common Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Treasury Stock [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Additional Paid-in Capital [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] AOCI Attributable to Parent [Member]	Conversion of Series A-1 Preferred to Common Stock [Member] Retained Earnings [Member]	Conversion of Series A-1 Preferred to Common Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Common Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Treasury Stock [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Additional Paid-in Capital [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] AOCI Attributable to Parent [Member]	Conversion of Series D Preferred Stock to Common Stock [Member] Retained Earnings [Member]	Conversion of Series D Preferred Stock to Common Stock [Member]	Series B Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Series B Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Series B Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Series B Preferred Stock Dividends [Member] Common Stock [Member]	Series B Preferred Stock Dividends [Member] Treasury Stock [Member]	Series B Preferred Stock Dividends [Member] Additional Paid-in Capital [Member]	Series B Preferred Stock Dividends [Member] AOCI Attributable to Parent [Member]	Series B Preferred Stock Dividends [Member] Retained Earnings [Member]	Series B Preferred Stock Dividends [Member]	Series A Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Series A Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Series A Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Series A Preferred Stock Dividends [Member] Common Stock [Member]	Series A Preferred Stock Dividends [Member] Treasury Stock [Member]	Series A Preferred Stock Dividends [Member] Additional Paid-in Capital [Member]	Series A Preferred Stock Dividends [Member] AOCI Attributable to Parent [Member]	Series A Preferred Stock Dividends [Member] Retained Earnings [Member]	Series A Preferred Stock Dividends [Member]	Series A-1 Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Series A-1 Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Series A-1 Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Series A-1 Preferred Stock Dividends [Member] Common Stock [Member]	Series A-1 Preferred Stock Dividends [Member] Treasury Stock [Member]	Series A-1 Preferred Stock Dividends [Member] Additional Paid-in Capital [Member]	Series A-1 Preferred Stock Dividends [Member] AOCI Attributable to Parent [Member]	Series A-1 Preferred Stock Dividends [Member] Retained Earnings [Member]	Series A-1 Preferred Stock Dividends [Member]	Series C Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Series C Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Series C Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Series C Preferred Stock Dividends [Member] Common Stock [Member]	Series C Preferred Stock Dividends [Member] Treasury Stock [Member]	Series C Preferred Stock Dividends [Member] Additional Paid-in Capital [Member]	Series C Preferred Stock Dividends [Member] AOCI Attributable to Parent [Member]	Series C Preferred Stock Dividends [Member] Retained Earnings [Member]	Series C Preferred Stock Dividends [Member]	Series D Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Series D Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Series D Preferred Stock Dividends [Member] Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Series D Preferred Stock Dividends [Member] Common Stock [Member]	Series D Preferred Stock Dividends [Member] Treasury Stock [Member]	Series D Preferred Stock Dividends [Member] Additional Paid-in Capital [Member]	Series D Preferred Stock Dividends [Member] AOCI Attributable to Parent [Member]	Series D Preferred Stock Dividends [Member] Retained Earnings [Member]	Series D Preferred Stock Dividends [Member]	Preferred Stock Outstanding [Member] Series A Preferred Stock [Member]	Preferred Stock Outstanding [Member] Series A-1 Preferred Stock [Member]	Preferred Stock Outstanding [Member] Series B Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Series A-1 Preferred Stock [Member]	Total
Balance (in shares) at Dec. 31, 2019																																																																																		37,467	0	239,400	113,353,176	(6,704)
Balance at Dec. 31, 2019																																																																																		$ 0	$ 0	$ 2,000	$ 1,133,000	$ (64,000)	$ 195,079,000	$ (1,741,000)	$ (203,171,000)		$ (8,762,000)
Accretion of Preferred Stock discount																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	(2,688,000)	0	0		$ (2,688,000)
Shares issued pursuant to option exchange and RSU vesting (in shares)																																																																																		0	0	0	1,883,248	0					1,883,248
Stock-based compensation expense - RSUs																																																																																		$ 0	$ 0	$ 0	$ 19,000	$ 0	843,000	0	0		$ 862,000
Shares issued for cash (in shares)																																																																																		0	0	0	15,700,000	0					15,700,000
Issuance of Common Stock for cash																																																																																		$ 0	$ 0	$ 0	$ 157,000	$ 0	2,103,000	0	0		$ 2,260,000
Shares issued to secure financing facility (in shares)																																																																																		0		0	2,500,000	0					2,500,000
Issuance of Common Stock as issuance costs for equity line of credit																																																																																		$ 0	$ 0	$ 0	$ 25,000	$ 0	375,000	0	0		$ 400,000
Shares issued pursuant to conversion (in shares)	(18,828)	18,828	0	0	0					(3,728)			18,640,000					18,640,000	0	(4,046)		19,016,452					19,016,452
Conversion of stock	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1,849,000	$ 0	$ 0	$ 1,849,000	$ 0			$ 186,000		$ (186,000)			$ 0	$ 0	$ 0		$ 190,000		$ (190,000)			$ 0
Shares issued as payment of stock dividend on Series C Preferred (in shares)																																														0	0	0	1,388,876	0				1,388,876	0	0	0	1,159,416	0				1,159,416	0	0	0	6,455,149	0													6,455,149
Dividends on preferred stock																																														$ 0	$ 0	$ 0	$ 14,000	$ 0	$ 104,000	$ 0	$ (1,967,000)	$ (1,849,000)	$ 0	$ 0	$ 0	$ 12,000	$ 0	$ 81,000	$ 0	$ (93,000)	$ 0	$ 0	$ 0	$ 0	$ 65,000	$ 0	$ 625,000	$ 0	$ (690,000)	$ 0
Dividends																																					$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (51,000)	$ (51,000)
Dividends																																																																									$ 0	$ 0	$ 0	$ 0	$ 0	$ (142,000)	$ 0	$ 0	$ (142,000)
Foreign currency translation adjustment																																																																																		0	0	0	0	0	0	(151,000)	0		(151,000)
Additional minimum pension liability																																																																																		0	0	0	0	0	0	(97,000)	0		(97,000)
Net income (loss)																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	0	0	(7,253,000)		(7,253,000)
Balance (in shares) at Dec. 31, 2020																																																																																		14,911	14,782	239,400	180,096,317	(6,704)
Balance at Dec. 31, 2020																																																																																		$ 0	$ 0	$ 2,000	$ 1,801,000	$ (64,000)	193,652,000	(1,989,000)	(213,225,000)		(19,823,000)
Dividends																																					0	0	0	0	0	0	0	(51,000)	(51,000)
Deemed dividend from issuance of Series D preferred stock																																																																																		0	0	0	0	0	(4,201,000)	0	0		(4,201,000)
Accretion of Preferred Stock discount																																																																																		0	0	0	0	0	(6,806,000)	0	0		(6,806,000)
Stock-based compensation expense - options																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	1,494,000	0	0		$ 1,494,000
Shares issued pursuant to option exchange and RSU vesting (in shares)																																																																																		0	0	0	902,630	0					902,630
Stock-based compensation expense - RSUs																																																																																		$ 0	$ 0	$ 0	$ 9,000	$ 0	(1,000)	0	0		$ 8,000
Stock-based compensation expense - warrants																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	26,000	0	0		$ 26,000
Shares issued for cash (in shares)																																																																																		0	0	0	1,000,000	0					1,000,000
Issuance of Common Stock for cash																																																																																		$ 0	$ 0	$ 0	$ 10,000	$ 0	90,000	0	0		$ 100,000
Shares issued to secure financing facility (in shares)																																																																																		0	0	0	1,000,000	0					1,000,000
Issuance of Common Stock as issuance costs for equity line of credit																																																																																		$ 0	$ 0	$ 0	$ 10,000	$ 0	60,000	0	0		$ 70,000
Shares issued as compensation in lieu of cash (in shares)																																																																																		0	0	0	921,218	0					921,218
Issuance of common stock in lieu of cash																																																																																		$ 0	$ 0	$ 0	$ 9,000	$ 0	49,000	0	0		$ 58,000
Issuance of common stock pursuant to warrant exercise (in shares)																																																																																		0	0	0	400	0
Issuance of common stock pursuant to warrant exercise																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	0	0	0		0
Shares issued pursuant to conversion (in shares)										(14,911)	0	0	74,562,000	0				74,562,000	0	(14,782)	0	73,910,000	0				73,910,000	0	0	0	11,149,123	0
Conversion of stock										$ (0)	$ 0	$ 0	$ 746,000	$ 0	$ (745,000)	$ 0	$ 0	$ (0)	$ 0	$ (0)	$ 0	$ 739,000	$ 0	$ (739,000)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 110,000	$ 0	$ 851,000	$ 0	$ (5,000)	$ 956,000
Recission of common shares (in shares)																																																																																		0	0	0	(2,817)	0
Shares issued as payment of stock dividend on Series C Preferred (in shares)																																														0	0	0	1,911,587	0				1,911,587	0	0	0	1,789,587	0				1,789,587																											1,789,587
Dividends on preferred stock																																														$ 0	$ 0	$ 0	$ 19,000	$ 0	$ 113,000	$ 0	$ (132,000)	$ (0)	$ 0	$ 0	$ 0	$ 18,000	$ 0	$ 104,000	$ 0	$ (122,000)	$ 0
Dividends																																					0	0	0	0	0	0	0	(51,000)	(51,000)
Dividends																																																																									$ 0	$ 0	$ 0	$ 0	$ 0	$ (999,000)	$ 0	$ 0	$ (999,000)
Foreign currency translation adjustment																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	0	75,000	0		75,000
Additional minimum pension liability																																																																																		0	0	0	0	0	0	518,000	0		518,000
Net income (loss)																																																																																		$ 0	$ 0	$ 0	$ 0	$ 0	0	0	9,282,000		9,282,000
Balance (in shares) at Dec. 31, 2021																																																																																		0	0	239,400	347,240,045	(6,704)
Balance at Dec. 31, 2021																																																																																		$ 0	$ 0	$ 2,000	$ 3,471,000	$ (64,000)	$ 187,148,000	$ (1,396,000)	$ (204,253,000)		(15,092,000)
Dividends																																					$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (51,000)	$ (51,000)
Deemed dividend from issuance of Series D preferred stock																																																																																											$ (4,201,000)