v3.26.1
Note 4 - Investment Securities - Investment Securities by Contractual Maturity (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Under one year, amortized cost $ 790,000  
Under one year, fair value 789,000  
After one year through five years, amortized cost 6,524,000  
After one year through five years, estimated fair value 6,624,000  
After five years through ten years, amortized cost 17,201,000  
After five years through ten years, estimated fair value 17,470,000  
After ten years, amortized cost 67,594,000  
After ten years, estimated fair value 63,783,000  
Investment securities not due at a single maturity date, amortized cost 141,861,000  
Investment securities not due at a single maturity date, estimated fair value 134,764,000  
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 491,490,000 $ 473,433,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest 476,595,000 437,735,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]    
Investment securities not due at a single maturity date, amortized cost 257,520,000  
Investment securities not due at a single maturity date, estimated fair value 253,165,000  
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 257,520,000 243,709,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest $ 253,165,000 $ 228,391,000