Note 3 - Investments, Held to Maturity - Summary of HTM Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair value, less than 12 months, HTM	$ 9,906	$ 40,732
Unrealized losses, less then 12 months, HTM	156	458
Fair value, more than 12 months, HTM	56,428	83,261
Unrealized loss, more than 12 months, HTM	5,024	4,941
Fair value, unrealized loss position, HTM	66,334	123,993
Unrealized loss, unrealized loss position, HTM	5,180	5,399
US Treasury and Government [Member]
Fair value, less than 12 months, HTM	0	0
Unrealized losses, less then 12 months, HTM	0	0
Fair value, more than 12 months, HTM	11,928	23,596
Unrealized loss, more than 12 months, HTM	39	278
Fair value, unrealized loss position, HTM	11,928	23,596
Unrealized loss, unrealized loss position, HTM	39	278
Taxable Municipal Bonds [Member]
Fair value, less than 12 months, HTM	0	0
Unrealized losses, less then 12 months, HTM	0	0
Fair value, more than 12 months, HTM	953	934
Unrealized loss, more than 12 months, HTM	20	28
Fair value, unrealized loss position, HTM	953	934
Unrealized loss, unrealized loss position, HTM	20	28
Collateralized Mortgage-Backed Securities [Member]
Fair value, less than 12 months, HTM	9,906	40,732
Unrealized losses, less then 12 months, HTM	156	458
Fair value, more than 12 months, HTM	43,547	58,731
Unrealized loss, more than 12 months, HTM	4,965	4,635
Fair value, unrealized loss position, HTM	53,453	99,463
Unrealized loss, unrealized loss position, HTM	$ 5,121	$ 5,093