Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenues:
Revenues	$ 2,586,000	$ 1,913,000
Operating (loss) income:
Operating income (loss)	(620,000)	(1,167,000)
Interest expense, net	(103,000)	(108,000)
(Loss) gain on foreign currency remeasurement	(36,000)	202,000
Gain on extinguishment of debt	77,000
Pension benefit	67,000	36,000
Loss before income taxes	(615,000)	(1,037,000)
Income tax expense	(6,000)	(6,000)
Net loss	(621,000)	(1,043,000)
Assets
Assets	7,368,000	7,055,000	$ 7,055,000
Operating Segments [Member]
Assets
Assets	7,017,000	7,012,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(313,000)	(547,000)
Assets
Assets	351,000	43,000
Digital Product Sales [Member]
Revenues:
Revenues	2,093,000	1,334,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	2,093,000	1,334,000
Operating (loss) income:
Operating income (loss)	(626,000)	(982,000)
Assets
Assets	5,397,000	5,231,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	493,000	579,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	493,000	579,000
Operating (loss) income:
Operating income (loss)	319,000	362,000
Assets
Assets	$ 1,620,000	$ 1,781,000