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Note 11 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available for sale, at fair value $ 408,469 $ 437,271
Equity Securities, FV-NI, Current 990,000,000 1,300
Equity securities 990,000,000 1,300
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Securities available for sale, at fair value 66,512 72,044
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, at fair value 52,312 25,173
US Government Agencies Debt Securities [Member]    
Securities available for sale, at fair value 121,835 129,505
US Treasury and Government [Member]    
Securities available for sale, at fair value 34,383 63,084
Municipal Notes [Member]    
Securities available for sale, at fair value 133,427 147,465
Fair Value, Recurring [Member]    
Securities available for sale, at fair value 408,469 437,271
Equity Securities, FV-NI, Current 990 1,260
Equity securities 990 1,260
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 34,383 63,084
Equity Securities, FV-NI, Current 990 1,260
Equity securities 990 1,260
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 374,086 374,187
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
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 66,512 72,044
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
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 66,512 72,044
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
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, at fair value 52,312 25,173
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 52,312 25,173
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale, at fair value 121,835 129,505
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
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 121,835 129,505
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
Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Securities available for sale, at fair value 34,383 63,084
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 34,383 63,084
Fair Value, Recurring [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 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
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale, at fair value 133,427 147,465
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale, at fair value 0 0
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale, at fair value 133,427 147,465
Fair Value, Recurring [Member] | Municipal Notes [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale, at fair value 0 0
Fair Value, Nonrecurring [Member]    
Collateral dependent loans 807 54
Commercial Business 807 54
Fair Value, Nonrecurring [Member] | Residential Construction Segment [Member]    
Collateral dependent loans 37 27
Commercial Business 37 27
Fair Value, Nonrecurring [Member] | Commercial Business [Member]    
Collateral dependent loans 770  
Commercial Business 770  
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Collateral dependent loans   27
Commercial Business   27
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Collateral dependent loans 0 0
Commercial Business 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Construction Segment [Member]    
Collateral dependent loans 0 0
Commercial Business 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Business [Member]    
Collateral dependent loans 0  
Commercial Business 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage Segment [Member]    
Collateral dependent loans   0
Commercial Business   0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Collateral dependent loans 0 0
Commercial Business 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Construction Segment [Member]    
Collateral dependent loans 0 0
Commercial Business 0 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Business [Member]    
Collateral dependent loans 0  
Commercial Business 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Segment [Member]    
Collateral dependent loans   0
Commercial Business   0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Collateral dependent loans 807 54
Commercial Business 807 54
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Construction Segment [Member]    
Collateral dependent loans 37 27
Commercial Business 37 27
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Business [Member]    
Collateral dependent loans 770  
Commercial Business $ 770  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Segment [Member]    
Collateral dependent loans   27
Commercial Business   $ 27