Note 13 - Fair Value of Financial Instruments - Fair Value Measurements, Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available For Sale ("AFS")	$ 532,469	$ 537,640
Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	52,752	53,115
Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	341,179	336,170
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")	532,469	537,640
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Student Loan Pools [Member]
Available For Sale ("AFS")	47,703	50,366
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds [Member]
Available For Sale ("AFS")	70,800	76,753
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Tax Exempt Municipal Bonds [Member]
Available For Sale ("AFS")	20,035	21,236
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	52,752	53,115
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	341,179	336,170
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