Business Segment Data (Details) - Business Segment Data - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues:
Revenues	$ 4,349,000	$ 3,665,000
Operating (loss) income:
Operating income (loss)	(637,000)	(220,000)
Interest expense, net	(144,000)	(142,000)
Loss on foreign currency remeasurement	(8,000)	(16,000)
Gain on forgiveness of PPP loan		824,000
Pension (expense) benefit	(63,000)	53,000
(Loss) income before income taxes	(852,000)	499,000
Income tax expense	(6,000)	(6,000)
Net (loss) income	(858,000)	493,000
Assets
Assets	8,839,000		$ 9,412,000
Operating Segments [Member]
Assets
Assets	8,789,000		9,364,000
Corporate, Non-Segment [Member]
Operating (loss) income:
Operating income (loss)	(459,000)	(406,000)
Assets
Assets	50,000		48,000
Digital Product Sales [Member]
Revenues:
Revenues	4,121,000	3,237,000
Digital Product Sales [Member] | Operating Segments [Member]
Revenues:
Revenues	4,121,000	3,237,000
Operating (loss) income:
Operating income (loss)	(301,000)	(71,000)
Assets
Assets	7,784,000		8,221,000
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	228,000	428,000
Digital Product Lease And Maintenance [Member] | Operating Segments [Member]
Revenues:
Revenues	228,000	428,000
Operating (loss) income:
Operating income (loss)	123,000	$ 257,000
Assets
Assets	$ 1,005,000		$ 1,143,000