Note 5 - Leases - Lease Cost and Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating lease cost	$ 133,000	$ 59,000	$ 219,000	$ 265,000
Total lease cost	118,000	29,000	195,000	136,000
Cash paid for amounts included in the measurement of lease liabilities - Operating leases	$ 133,000	$ 59,000	$ 219,000	$ 265,000
Weighted-average remaining lease term - Operating leases in years (Year)	7 years 10 months 6 days	10 months 20 days	7 years 10 months 6 days	10 months 20 days
Weighted-average discount rate - Operating leases	8.00%	4.99%	8.00%	4.99%
Related Party [Member]
Sublease income, related party	$ (15,000)	$ (30,000)	$ (24,000)	$ (129,000)