Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenues:
Revenues	$ 2,887,000	$ 2,049,000	$ 5,473,000	$ 3,962,000
Operating (loss) income:
Operating income (loss)	(1,043,000)	(1,140,000)	(1,663,000)	(2,307,000)
Interest expense, net	(157,000)	(155,000)	(260,000)	(263,000)
(Loss) gain on foreign currency remeasurement	(36,000)	(89,000)	(72,000)	113,000
Gain on debt extinguishment			77,000
Pension benefit	67,000	37,000	134,000	73,000
Loss before income taxes	(1,169,000)	(1,347,000)	(1,784,000)	(2,384,000)
Income tax expense	(6,000)	(6,000)	(12,000)	(12,000)
Net loss	(1,175,000)	(1,353,000)	(1,796,000)	(2,396,000)
Assets
Assets	6,603,000		6,603,000		$ 7,055,000
Operating Segments [Member]
Assets
Assets	6,560,000		6,560,000		7,012,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(271,000)	(594,000)	(584,000)	(1,141,000)
Assets
Assets	43,000		43,000		43,000
Digital Product Sales [Member]
Revenues:
Revenues	2,396,000	1,518,000	4,489,000	2,852,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	2,396,000	1,518,000	4,489,000	2,852,000
Operating (loss) income:
Operating income (loss)	(1,095,000)	(912,000)	(1,721,000)	(1,894,000)
Assets
Assets	5,099,000		5,099,000		5,231,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	491,000	531,000	984,000	1,110,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	491,000	531,000	984,000	1,110,000
Operating (loss) income:
Operating income (loss)	323,000	$ 366,000	642,000	$ 728,000
Assets
Assets	$ 1,461,000		$ 1,461,000		$ 1,781,000