Note 13 - Fair Value of Financial Instruments - Fair Value Measurements, Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available For Sale ("AFS")	$ 540,752	$ 525,623
Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	54,048	52,560
Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	383,040	362,995
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")	540,752	525,623
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Student Loan Pools [Member]
Available For Sale ("AFS")	38,455	39,584
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds [Member]
Available For Sale ("AFS")	59,359	64,426
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Tax Exempt Municipal Bonds [Member]
Available For Sale ("AFS")	5,850	6,058
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]
Available For Sale ("AFS")	54,048	52,560
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Available For Sale ("AFS")	383,040	362,995
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