Note 21 - Carrying Amounts and Fair Value of Financial Instruments - Fair Value Measurements, Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair value, AFS	$ 525,623	$ 537,640
Taxable Municipal Bonds [Member]
Fair value, AFS	52,560	53,115
Collateralized Mortgage-Backed Securities [Member]
Fair value, AFS	362,995	336,170
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Student Loan Pools [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | SBA Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Tax Exempt Municipal Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Taxable Municipal Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, AFS	525,623	537,640
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Student Loan Pools [Member]
Fair value, AFS	39,584	50,366
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds [Member]
Fair value, AFS	64,426	76,753
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Tax Exempt Municipal Bonds [Member]
Fair value, AFS	6,058	21,236
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]
Fair value, AFS	52,560	53,115
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Fair value, AFS	362,995	336,170
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Student Loan Pools [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | SBA Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Tax Exempt Municipal Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Municipal Bonds [Member]
Fair value, AFS	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member]
Fair value, AFS	$ 0	$ 0