Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenues:
Revenues	$ 4,472,000	$ 3,450,000	$ 11,818,000	$ 11,047,000
Operating income (loss):
Operating income (loss)	(214,000)	(2,827,000)	(418,000)	(3,582,000)
Interest expense, net	(67,000)	(238,000)	(402,000)	(652,000)
Gain (loss) on foreign currency remeasurement	29,000	(48,000)	(78,000)	74,000
Loss on debt extinguishment			(193,000)
Gain on sale leaseback transaction				11,000
Pension (expense) benefit	(18,000)	33,000	(55,000)	101,000
Loss before income taxes	(270,000)	(3,080,000)	(1,146,000)	(4,048,000)
Income tax expense	(7,000)		(19,000)
Net loss	(277,000)	(3,080,000)	(1,165,000)	(4,048,000)
Assets
Assets	13,816,000		13,816,000		$ 11,466,000
Digital Product Sales [Member]
Revenues:
Revenues	3,951,000	2,857,000	10,155,000	9,158,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	521,000	593,000	1,663,000	1,889,000
Operating Segments [Member]
Assets
Assets	13,418,000		13,418,000		10,743,000
Operating Segments [Member] | Digital Product Sales [Member]
Revenues:
Revenues	3,951,000	2,857,000	10,155,000	9,158,000
Operating income (loss):
Operating income (loss)	220,000	(1,903,000)	584,000	(1,785,000)
Assets
Assets	9,336,000		9,336,000		7,689,000
Operating Segments [Member] | Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	521,000	593,000	1,663,000	1,889,000
Operating income (loss):
Operating income (loss)	296,000	241,000	969,000	789,000
Assets
Assets	4,082,000		4,082,000		3,054,000
Corporate, Non-Segment [Member]
Operating income (loss):
Operating income (loss)	(730,000)	$ (1,165,000)	(1,971,000)	$ (2,586,000)
Assets
Assets	$ 398,000		$ 398,000		$ 723,000