Note 7 - Investments, Held to Maturity ("HTM") - Summary of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized cost, HTM	$ 159,085	$ 163,072
Gross unrealized gains, HTM	1,155	867
Gross unrealized losses, HTM	(5,302)	(5,399)
HTM, fair value	154,938	158,540
US Treasury and Government [Member]
Amortized cost, HTM	23,904	23,874
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	(249)	(278)
HTM, fair value	23,655	23,596
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Amortized cost, HTM	1,000	1,000
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	(2)	0
HTM, fair value	998	1,000
Collateralized Loan Obligations [Member]
Amortized cost, HTM	15,995	16,881
Gross unrealized gains, HTM	392	278
Gross unrealized losses, HTM	0	0
HTM, fair value	16,387	17,159
Small Business Administration Bonds [Member]
Amortized cost, HTM	10,282	11,305
Gross unrealized gains, HTM	378	493
Gross unrealized losses, HTM	0	0
HTM, fair value	10,660	11,798
Taxable Municipal Bonds [Member]
Amortized cost, HTM	965	962
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	(32)	(28)
HTM, fair value	933	934
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, HTM	106,939	109,050
Gross unrealized gains, HTM	385	96
Gross unrealized losses, HTM	(5,019)	(5,093)
HTM, fair value	$ 102,305	$ 104,053