Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenues:
Revenues	$ 2,896,000	$ 4,472,000	$ 6,858,000	$ 11,818,000
Operating (loss) income:
Operating income (loss)	(776,000)	(214,000)	(3,083,000)	(418,000)
Interest expense, net	(100,000)	(67,000)	(363,000)	(402,000)
(Loss) gain on foreign currency remeasurement	(49,000)	29,000	64,000	(78,000)
Gain (loss) on debt extinguishment	137,000		137,000	(193,000)
Pension benefit (expense)	37,000	(18,000)	110,000	(55,000)
Loss before income taxes	(751,000)	(270,000)	(3,135,000)	(1,146,000)
Income tax expense	(7,000)	(7,000)	(19,000)	(19,000)
Net loss	(758,000)	(277,000)	(3,154,000)	(1,165,000)
Assets
Assets	9,264,000		9,264,000		$ 12,254,000
Operating Segments [Member]
Assets
Assets	9,233,000		9,233,000		11,719,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(114,000)	(730,000)	(1,255,000)	(1,971,000)
Assets
Assets	31,000		31,000		535,000
Digital Product Sales [Member]
Revenues:
Revenues	2,405,000	3,951,000	5,257,000	10,155,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	2,405,000	3,951,000	5,257,000	10,155,000
Operating (loss) income:
Operating income (loss)	(1,008,000)	220,000	(2,902,000)	584,000
Assets
Assets	6,925,000		6,925,000		8,204,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	491,000	521,000	1,601,000	1,663,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	491,000	521,000	1,601,000	1,663,000
Operating (loss) income:
Operating income (loss)	346,000	$ 296,000	1,074,000	$ 969,000
Assets
Assets	$ 2,308,000		$ 2,308,000		$ 3,515,000