Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues:
Revenues	$ 1,913,000	$ 3,599,000
Operating (loss) income:
Operating (loss) income	(1,167,000)	(239,000)
Interest expense, net	(108,000)	(255,000)
Gain (loss) on foreign currency remeasurement	202,000	(57,000)
Gain on extinguishment of debt		52,000
Pension benefit (expense)	36,000	(18,000)
Loss before income taxes	(1,037,000)	(517,000)
Income tax expense	(6,000)	(6,000)
Net loss	(1,043,000)	(523,000)
Assets
Assets	11,670,000	12,254,000	$ 12,254,000
Operating Segments [Member]
Assets
Assets	11,090,000	11,719,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating (loss) income	(547,000)	(613,000)
Assets
Assets	580,000	535,000
Digital Product Sales [Member]
Revenues:
Revenues	1,334,000	3,091,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	1,334,000	3,091,000
Operating (loss) income:
Operating (loss) income	(982,000)	116,000
Assets
Assets	7,614,000	8,204,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	579,000	508,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	579,000	508,000
Operating (loss) income:
Operating (loss) income	362,000	258,000
Assets
Assets	$ 3,476,000	$ 3,515,000