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Note 11 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Securities available for sale, at fair value $ 391,718 $ 389,243
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 391,718 389,243
Equity Securities, FV-NI, Current 905,000,000 887,000,000
Equity securities 905,000,000 887,000,000
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available for sale, at fair value 71,201 67,941
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 71,201 67,941
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, at fair value 64,516 47,518
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 64,516 47,518
US Government Agencies Debt Securities [Member]    
Securities available for sale, at fair value 108,015 118,080
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 108,015 118,080
US Treasury and Government [Member]    
Securities available for sale, at fair value 16,693 21,549
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 16,693 21,549
Municipal Notes [Member]    
Securities available for sale, at fair value 131,293 134,155
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 131,293 134,155
Fair Value, Recurring [Member]    
Securities available for sale, at fair value 391,718 389,243
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 391,718 389,243
Equity Securities, FV-NI, Current 905 886
Equity securities 905 886
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 16,693 21,549
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 16,693 21,549
Equity Securities, FV-NI, Current 905 886
Equity securities 905 886
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 375,025 367,694
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 375,025 367,694
Equity Securities, FV-NI, Current 0 0
Equity securities 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Equity Securities, FV-NI, Current 0 0
Equity securities 0 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available for sale, at fair value 71,201 67,941
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 71,201 67,941
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 71,201 67,941
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 71,201 67,941
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, at fair value 64,516 47,518
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 64,516 47,518
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 64,516 47,518
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 64,516 47,518
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale, at fair value 108,015 118,080
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 108,015 118,080
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 108,015 118,080
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 108,015 118,080
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale, at fair value 16,693 21,549
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 16,693 21,549
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 16,693 21,549
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 16,693 21,549
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale, at fair value 131,293 134,155
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 131,293 134,155
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 131,293 134,155
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 131,293 134,155
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Securities available for sale, at fair value (amortized cost $417,251 and $418,935, respectively) 0 0
Fair Value, Nonrecurring [Member]    
Commercial Business 669 729
Collateral dependent loans 669 729
Fair Value, Nonrecurring [Member] | Commercial Business [Member]    
Commercial Business 633 693
Collateral dependent loans 633 693
Fair Value, Nonrecurring [Member] | Residential Construction Segment [Member]    
Commercial Business 36 36
Collateral dependent loans 36 36
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Business [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Construction Segment [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Business [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Construction Segment [Member]    
Commercial Business 0 0
Collateral dependent loans 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Commercial Business 669 729
Collateral dependent loans 669 729
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Business [Member]    
Commercial Business 633 693
Collateral dependent loans 633 693
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Construction Segment [Member]    
Commercial Business 36 36
Collateral dependent loans $ 36 $ 36