Business Segment Data (Details) - Business Segment Data - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 9,445,000	$ 17,035,000
Operating (loss) income:
Operating loss	(4,616,000)	(451,000)
Interest expense, net	(425,000)	(504,000)
Loss on foreign currency remeasurement	(57,000)	(130,000)
Gain (loss) on extinguishment of debt	137,000	(193,000)
Pension benefit (expense)	111,000	(83,000)
Loss before income taxes	(4,850,000)	(1,361,000)
Income tax benefit (expense)	7,000	(41,000)
Net loss	(4,843,000)	(1,402,000)
Assets:
Assets	7,055,000	12,254,000
Depreciation and amortization:
Depreciation and amortization	540,000	668,000
Capital expenditures:
Capital expenditures	190,000	421,000
Operating Segments [Member]
Assets:
Assets	7,012,000	11,719,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating loss	(836,000)	(2,386,000)
Assets:
Assets	43,000	535,000
Depreciation and amortization:
Depreciation and amortization	1,000	7,000
Capital expenditures:
Capital expenditures	1,000	1,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	7,378,000	14,710,000
Operating (loss) income:
Operating loss	(5,169,000)	183,000
Assets:
Assets	5,231,000	8,204,000
Depreciation and amortization:
Depreciation and amortization	251,000	234,000
Capital expenditures:
Capital expenditures	173,000	376,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	2,067,000	2,325,000
Operating (loss) income:
Operating loss	1,389,000	1,752,000
Assets:
Assets	1,781,000	3,515,000
Depreciation and amortization:
Depreciation and amortization	288,000	427,000
Capital expenditures:
Capital expenditures	$ 16,000	$ 44,000