Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenues:
Revenues	$ 3,463,000	$ 2,986,000	$ 6,087,000	$ 7,335,000
Operating (loss) income:
Operating (loss) income	(679,000)	(562,000)	(1,801,000)	(1,199,000)
Interest expense, net	(147,000)	(194,000)	(289,000)	(338,000)
Gain (loss) on foreign currency remeasurement	24,000	(51,000)	76,000	(59,000)
Pension expense	(50,000)	(62,000)	(100,000)	(125,000)
Loss before income taxes	(852,000)	(869,000)	(2,114,000)	(1,721,000)
Income tax expense	(6,000)	(6,000)	(13,000)	(12,000)
Net loss	(858,000)	(875,000)	(2,127,000)	(1,733,000)
Assets
Assets	7,933,000		7,933,000		$ 8,330,000
Operating Segments [Member]
Assets
Assets	7,764,000		7,764,000		8,145,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating (loss) income:
Operating (loss) income	(489,000)	(490,000)	(962,000)	(949,000)
Assets
Assets	169,000		169,000		185,000
Digital Product Sales [Member]
Revenues:
Revenues	3,273,000	2,767,000	5,702,000	6,888,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	3,273,000	2,767,000	5,702,000	6,888,000
Operating (loss) income:
Operating (loss) income	(266,000)	(181,000)	(1,025,000)	(482,000)
Assets
Assets	7,213,000		7,213,000		7,502,000
Digital Product Lease and Maintenance [Member]
Revenues:
Revenues	190,000	219,000	385,000	447,000
Digital Product Lease and Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	190,000	219,000	385,000	447,000
Operating (loss) income:
Operating (loss) income	76,000	$ 109,000	186,000	$ 232,000
Assets
Assets	$ 551,000		$ 551,000		$ 643,000