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Note 6 - Leases (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Lease, Payments $ 1.8 $ 1.0 $ 1.4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 0.3 $ 0.3 $ 0.8
Minimum [Member]      
Lessee, Operating Lease, Renewal Term (Year) 1 year    
Maximum [Member]      
Lessee, Operating Lease, Renewal Term (Year) 10 years