Note 7 - Investments, Held to Maturity ("HTM") - Schedule of Credit Ratings for Held To Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	$ 159,085	$ 163,072
Private Label Taxable Municipal Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	965
Private Label Taxable Municipal Securities [Member] | Moody's, Aa1 Rating [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	965
Private Label Mortgage Backed Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	12,460
Private Label Mortgage Backed Securities [Member] | Moody's, Aaa Rating [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	7,260
Private Label Mortgage Backed Securities [Member] | Moody's, A1 Rating [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	1,566
Private Label Mortgage Backed Securities [Member] | Not Rated by Moodys [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	$ 3,634