v3.26.1
Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Investment securities available for sale, Estimated fair value $ 476,595,000 $ 437,735,000
Fair Value, Recurring [Member]    
Investment securities available for sale, Estimated fair value 476,595,000 437,735,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities available for sale, Estimated fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities available for sale, Estimated fair value 476,595,000 437,735,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities available for sale, Estimated fair value 0 0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]    
Investment securities available for sale, Estimated fair value 253,165,000 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]    
Investment securities available for sale, Estimated fair value 253,165,000 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities available for sale, Estimated fair value 0 0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities available for sale, Estimated fair value 253,165,000 228,391,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities available for sale, Estimated fair value 0 0
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]    
Investment securities available for sale, Estimated fair value 134,764,000 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member]    
Investment securities available for sale, Estimated fair value 134,764,000 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities available for sale, Estimated fair value 0 0
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities available for sale, Estimated fair value 134,764,000 121,870,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities available for sale, Estimated fair value 0 0
US States and Political Subdivisions Debt Securities [Member]    
Investment securities available for sale, Estimated fair value 88,666,000 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]    
Investment securities available for sale, Estimated fair value 88,666,000 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities available for sale, Estimated fair value 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities available for sale, Estimated fair value 88,666,000 87,474,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities available for sale, Estimated fair value $ 0 $ 0