Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenues:
Revenues	$ 3,599,000	$ 4,535,000
Operating (loss) income:
Operating (loss) income	(239,000)	139,000
Interest expense, net	(255,000)	(196,000)
(Loss) gain on foreign currency remeasurement	(57,000)	72,000
Gain on extinguishment of debt	52,000
Gain on sale leaseback transaction		11,000
Pension (expense) benefit	(18,000)	34,000
(Loss) income before income taxes	(517,000)	60,000
Income tax expense	(6,000)
Net (loss) income	(523,000)	60,000
Assets
Assets	12,510,000	11,466,000	$ 11,466,000
Digital Product Sales [Member]
Revenues:
Revenues	3,091,000	3,948,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	508,000	587,000
Operating Segments [Member]
Assets
Assets	12,079,000	10,743,000
Operating Segments [Member] | Digital Product Sales [Member]
Revenues:
Revenues	3,091,000	3,948,000
Operating (loss) income:
Operating (loss) income	116,000	560,000
Assets
Assets	7,606,000	7,689,000
Operating Segments [Member] | Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	508,000	587,000
Operating (loss) income:
Operating (loss) income	258,000	290,000
Assets
Assets	4,473,000	3,054,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating (loss) income	(613,000)	(711,000)
Assets
Assets	$ 431,000	$ 723,000