Note 3 - Investments, Held to Maturity - Summary of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized cost, HTM	$ 135,200	$ 163,072
Gross unrealized gains, HTM	882	867
Gross unrealized losses, HTM	(5,180)	(5,399)
HTM, fair value	130,902	158,540
US Treasury and Government [Member]
Amortized cost, HTM	11,967	23,874
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	(39)	(278)
HTM, fair value	11,928	23,596
Collateralized Loan Obligations [Member]
Amortized cost, HTM	13,202	16,881
Gross unrealized gains, HTM	333	278
Gross unrealized losses, HTM	0	0
HTM, fair value	13,535	17,159
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Amortized cost, HTM		1,000
Gross unrealized gains, HTM		0
Gross unrealized losses, HTM		0
HTM, fair value		1,000
Small Business Administration Bonds [Member]
Amortized cost, HTM	8,168	11,305
Gross unrealized gains, HTM	145	493
Gross unrealized losses, HTM	0	0
HTM, fair value	8,313	11,798
Taxable Municipal Bonds [Member]
Amortized cost, HTM	973	962
Gross unrealized gains, HTM	0	0
Gross unrealized losses, HTM	(20)	(28)
HTM, fair value	953	934
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, HTM	100,890	109,050
Gross unrealized gains, HTM	404	96
Gross unrealized losses, HTM	(5,121)	(5,093)
HTM, fair value	$ 96,173	$ 104,053