Note 3 - Securities - Available-for-sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
One year or less, amortized cost	$ 17,709
One year or less, fair value	17,535
After one year through five years, amortized cost	65,344
After one year through five years, fair value	61,839
After five years through ten years, amortized cost	112,971
After five years through ten years, fair value	97,101
After ten years, amortized cost	125,395
After ten years, fair value	107,769
Available-for-sale debt securities, amortized cost	537,912	$ 514,801
Available-for-sale debt securities	476,091	522,566
Collateralized Mortgage Obligations [Member]
Securities without a single maturity, amortized cost	177,874
Securities without a single maturity, fair value	156,243
Collateralized Mortgage-Backed Securities [Member]
Securities without a single maturity, amortized cost	23,332
Securities without a single maturity, fair value	20,663
Available-for-sale debt securities, amortized cost	23,332	25,467
Available-for-sale debt securities	20,663	25,506
Asset-Backed Securities [Member]
Securities without a single maturity, amortized cost	15,287
Securities without a single maturity, fair value	14,941
Available-for-sale debt securities, amortized cost	15,287	11,907
Available-for-sale debt securities	$ 14,941	$ 11,932

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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