Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenues:
Revenues	$ 3,747,000	$ 3,062,000	$ 7,346,000	$ 7,597,000
Operating (loss) income:
Operating income (loss)	35,000	(894,000)	(204,000)	(755,000)
Interest expense, net	(80,000)	(218,000)	(335,000)	(414,000)
(Loss) gain on foreign currency remeasurement	(50,000)	50,000	(107,000)	122,000
Loss on debt extinguishment	(245,000)		(193,000)
Gain on sale leaseback transaction				11,000
Pension (expense) benefit	(19,000)	34,000	(37,000)	68,000
Loss before income taxes	(359,000)	(1,028,000)	(876,000)	(968,000)
Income tax expense	(6,000)		(12,000)
Net loss	(365,000)	(1,028,000)	(888,000)	(968,000)
Assets
Assets	14,125,000		14,125,000		$ 11,466,000
Digital Product Sales [Member]
Revenues:
Revenues	3,113,000	2,353,000	6,204,000	6,301,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	634,000	709,000	1,142,000	1,296,000
Operating Segments [Member]
Assets
Assets	12,712,000		12,712,000		10,743,000
Operating Segments [Member] | Digital Product Sales [Member]
Revenues:
Revenues	3,113,000	2,353,000	6,204,000	6,301,000
Operating (loss) income:
Operating income (loss)	248,000	(442,000)	364,000	118,000
Assets
Assets	8,466,000		8,466,000		7,689,000
Operating Segments [Member] | Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	634,000	709,000	1,142,000	1,296,000
Operating (loss) income:
Operating income (loss)	415,000	258,000	673,000	548,000
Assets
Assets	4,246,000		4,246,000		3,054,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(628,000)	$ (710,000)	(1,241,000)	$ (1,421,000)
Assets
Assets	$ 1,413,000		$ 1,413,000		$ 723,000