Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues:
Revenues	$ 2,865,000	$ 2,896,000	$ 8,338,000	$ 6,858,000
Operating (loss) income:
Operating income (loss)	(1,017,000)	(776,000)	(2,680,000)	(3,083,000)
Interest expense, net	(103,000)	(100,000)	(363,000)	(363,000)
Gain (loss) on foreign currency remeasurement	62,000	(49,000)	(10,000)	64,000
Gain on debt extinguishment		137,000	77,000	137,000
Pension benefit	66,000	37,000	200,000	110,000
Loss before income taxes	(992,000)	(751,000)	(2,776,000)	(3,135,000)
Income tax expense	(7,000)	(7,000)	(19,000)	(19,000)
Net loss	(999,000)	(758,000)	(2,795,000)	(3,154,000)
Assets
Assets	7,007,000		7,007,000		$ 7,055,000
Operating Segments [Member]
Assets
Assets	6,721,000		6,721,000		7,012,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(259,000)	(114,000)	(843,000)	(1,255,000)
Assets
Assets	286,000		286,000		43,000
Digital Product Sales [Member]
Revenues:
Revenues	2,393,000	2,405,000	6,882,000	5,257,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	2,393,000	2,405,000	6,882,000	5,257,000
Operating (loss) income:
Operating income (loss)	(1,093,000)	(1,008,000)	(2,814,000)	(2,902,000)
Assets
Assets	5,441,000		5,441,000		5,231,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	472,000	491,000	1,456,000	1,601,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	472,000	491,000	1,456,000	1,601,000
Operating (loss) income:
Operating income (loss)	335,000	$ 346,000	977,000	$ 1,074,000
Assets
Assets	$ 1,280,000		$ 1,280,000		$ 1,781,000