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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Collateral dependent loans $ 0 $ 385
Fair Value, Inputs, Level 1 [Member]    
Collateral dependent loans 0 0
Fair Value, Inputs, Level 2 [Member]    
Collateral dependent loans 0 0
Fair Value, Inputs, Level 3 [Member]    
Collateral dependent loans $ 0 $ 385