Note 21 - Carrying Amounts and Fair Value of Financial Instruments - Fair Value Measurements, Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available For Sale ("AFS")	$ 537,640	$ 550,148
Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	53,115	50,770
Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	336,170	319,280
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Student Loan Pools [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | SBA Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Tax Exempt Municipal Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available For Sale ("AFS")	537,640	550,148
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Student Loan Pools [Member]
Available For Sale ("AFS")	50,366	59,158
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds [Member]
Available For Sale ("AFS")	76,753	99,630
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Tax Exempt Municipal Bonds [Member]
Available For Sale ("AFS")	21,236	21,310
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	53,115	50,770
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	336,170	319,280
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Student Loan Pools [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | SBA Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Tax Exempt Municipal Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	$ 0	$ 0