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Note 2 - Supplemental Balance Sheet Information - Property and Equipment (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Property and equipment, gross	$ 3,142,000	$ 3,020,000
Less accumulated depreciation	(2,873,000)	(2,739,000)
Property and equipment, net	$ 269,000	281,000
Equipment [Member]
Estimated useful life (Year)	5 years
Property and equipment, gross	$ 255	144,000
Leasehold Improvements [Member]
Property and equipment, gross	$ 725,000	725,000
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful life (Year)	2 years
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful life (Year)	5 years
Furniture and Fixtures [Member]
Estimated useful life (Year)	7 years
Property and equipment, gross	$ 16,000	16,000
Software and Software Development Costs [Member]
Estimated useful life (Year)	3 years
Property and equipment, gross	$ 2,146,000	$ 2,135,000

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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