Note 9 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans with no related allowance, unpaid principal balance	$ 46,853	$ 46,336
Loans with no related allowance, recorded investment	38,513	38,401
Loans with related allowance, unpaid principal balance	59,183	38,272
Loans with related allowance, recorded investment	47,820	27,445
Allowance	8,340	4,547
Unpaid principal balance	106,036	84,608
Recorded investment	86,333	65,846
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	15,898	15,879
Loans with no related allowance, recorded investment	11,304	11,342
Loans with related allowance, unpaid principal balance	34,167	14,294
Loans with related allowance, recorded investment	24,978	5,217
Allowance	5,293	894
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	24,988	24,437
Loans with no related allowance, recorded investment	21,459	21,209
Loans with related allowance, unpaid principal balance	17,760	17,930
Loans with related allowance, recorded investment	16,636	16,964
Allowance	3,017	3,631
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	5,967	6,020
Loans with no related allowance, recorded investment	5,750	5,850
Loans with related allowance, unpaid principal balance	7,256	6,048
Loans with related allowance, recorded investment	6,206	5,264
Allowance	$ 30	$ 22