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Note 7 - Derivatives and Hedging Activities - Changes in Fair Values of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unrealized loss at beginning of period, net of tax $ (19,979) $ (20,221)
Unrealized loss at end of period, net of tax (21,676) (19,979)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Amount of gain (loss) recognized in other comprehensive income, net of tax (1,187) 1,114
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Caplet Amortization.    
Amount reclassified from accumulated other comprehensive income $ (510) $ (872)