Note 5 - Leases - Lease Cost and Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating lease cost, net of impairment	$ 102,000	$ 87,000	$ 303,000	$ 258,000
Sublease income	(43,000)	0	(129,000)	0
Total lease cost	59,000	87,000	174,000	258,000
Cash paid for amounts included in the measurement of lease liabilities - Operating leases	$ 102,000	$ 87,000	$ 303,000	$ 258,000
Weighted-average remaining lease term - Operating leases in years (Year)	1 year 3 months 18 days	1 year 11 months 26 days	1 year 3 months 18 days	1 year 11 months 26 days
Weighted-average discount rate - Operating leases	5.71%	6.15%	5.71%	6.15%