Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Revenues:
Revenues	$ 2,986,000	$ 7,302,000	$ 7,335,000	$ 10,967,000
Operating income (loss):
Operating income (loss)	(562,000)	538,000	(1,199,000)	318,000
Interest expense, net	(194,000)	(130,000)	(338,000)	(272,000)
(Loss) gain on foreign currency remeasurement	(51,000)	76,000	(59,000)	60,000
Gain on forgiveness of PPP loan				824,000
Pension (expense) benefit	(62,000)	52,000	(125,000)	105,000
(Loss) income before income taxes	(869,000)	536,000	(1,721,000)	1,035,000
Income tax expense	(6,000)	(6,000)	(12,000)	(12,000)
Net (loss) income	(875,000)	530,000	(1,733,000)	1,023,000
Assets
Assets	9,421,000		9,421,000		$ 9,412,000
Operating Segments [Member]
Assets
Assets	9,223,000		9,223,000		9,364,000
Corporate, Non-Segment [Member]
Operating income (loss):
Operating income (loss)	(490,000)	(426,000)	(949,000)	(832,000)
Assets
Assets	198,000		198,000		48,000
Digital Product Sales [Member]
Revenues:
Revenues	2,767,000	7,016,000	6,888,000	10,253,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	2,767,000	7,016,000	6,888,000	10,253,000
Operating income (loss):
Operating income (loss)	(181,000)	831,000	(482,000)	760,000
Assets
Assets	6,769,000		6,769,000		8,221,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	219,000	286,000	447,000	714,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	219,000	286,000	447,000	714,000
Operating income (loss):
Operating income (loss)	109,000	$ 133,000	232,000	$ 390,000
Assets
Assets	$ 2,454,000		$ 2,454,000		$ 1,143,000