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Note 5 - Leases - Lease Cost and Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating lease cost $ 14,000 $ 103,000 $ 35,000 $ 206,000
Total lease cost 5,000 54,000 26,000 107,000
Cash paid for amounts included in the measurement of lease liabilities - Operating leases $ 14,000 $ 103,000 $ 35,000 $ 206,000
Weighted-average remaining lease term - Operating leases in years (Year) 8 years 4 months 17 days 11 months 1 day 8 years 4 months 17 days 11 months 1 day
Weighted-average discount rate - Operating leases 7.92% 5.28% 7.92% 5.28%
Related Party [Member]        
Sublease income, related party $ (9,000) $ (49,000) $ (9,000) $ (99,000)