Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues:
Revenues	$ 2,049,000	$ 3,747,000	$ 3,962,000	$ 7,346,000
Operating (loss) income:
Operating income (loss)	(1,140,000)	35,000	(2,307,000)	(204,000)
Interest expense, net	(155,000)	(80,000)	(263,000)	(335,000)
(Loss) gain on foreign currency remeasurement	(89,000)	(50,000)	113,000	(107,000)
Loss on debt extinguishment		(245,000)		(193,000)
Pension benefit (expense)	37,000	(19,000)	73,000	(37,000)
Loss before income taxes	(1,347,000)	(359,000)	(2,384,000)	(876,000)
Income tax expense	(6,000)	(6,000)	(12,000)	(12,000)
Net loss	(1,353,000)	(365,000)	(2,396,000)	(888,000)
Assets
Assets	10,783,000		10,783,000		$ 12,254,000
Operating Segments [Member]
Assets
Assets	10,535,000		10,535,000		11,719,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(594,000)	(628,000)	(1,141,000)	(1,241,000)
Assets
Assets	248,000		248,000		535,000
Digital Product Sales [Member]
Revenues:
Revenues	1,518,000	3,113,000	2,852,000	6,204,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	1,518,000	3,113,000	2,852,000	6,204,000
Operating (loss) income:
Operating income (loss)	(912,000)	248,000	(1,894,000)	364,000
Assets
Assets	7,422,000		7,422,000		8,204,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	531,000	634,000	1,110,000	1,142,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	531,000	634,000	1,110,000	1,142,000
Operating (loss) income:
Operating income (loss)	366,000	$ 415,000	728,000	$ 673,000
Assets
Assets	$ 3,113,000		$ 3,113,000		$ 3,515,000