The Company and its Significant Accounting Policies, Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Current Assets [Abstract]
Investment in sales-type sublease - current	$ 0	$ 532,000
Long-term Assets [Abstract]
Operating lease right-of-use asset	59,000	94,000	$ 68,000	$ 77,000	$ 86,000
Total leased assets	59,000	626,000
Current Liabilities [Abstract]
Obligations under finance lease - current portion	0	89,000
Operating lease right-of-use liability - current portion	43,000	40,000	42,000	41,000	40,000
Long-term Liabilities [Abstract]
Operating lease right-of-use liability - net of current portion	23,000	66,000	$ 34,000	$ 45,000	$ 56,000
Total lease liabilities	66,000	195,000
Lease Cost [Abstract]
Net lease cost	34,000
Net lease income		(7,000)
Operating lease [Abstract]
2022	46,000
2023	24,000
Total	70,000
Less amount representing interest	4,000
Present value of lease liabilities	$ 66,000	106,000
Discount rate	5.85%
Selling, General and Administrative Expenses [Member]
Lease Cost [Abstract]
Operating lease cost	$ 41,000	42,000
Interest Expense [Member]
Lease Cost [Abstract]
Finance lease cost, interest on lease liabilities	1,000	23,000
Interest Income - Sales-type Sublease [Member]
Lease Cost [Abstract]
Sublease income	$ 8,000	$ 72,000