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Note 13 - Leases (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Lease, Weighted Average Remaining Lease Term (Year) 3 years 4 months 20 days  
Operating Lease, Weighted Average Discount Rate, Percent 6.13%  
Operating Lease, Payments $ 0.5 $ 0.8
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0.4  
General and Administrative Expense [Member]    
Operating Lease, Cost 0.5 0.8
Variable Lease, Cost 0.2 0.2
Short-Term Lease, Cost $ 0.2 $ 0.1