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Note 3 - Investment Securities - Investment Securities Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Number of investment positions - less than twelve months, available for sale 29 64
Fair value - less than twelve months, available for sale $ 21,312 $ 50,929
Gross unrealized losses - less than twelve months, available for sale $ 317 $ 699
Number of investment positions - more than twelve months , available for sale 349 364
Fair value - more than twelve months, available for sale $ 282,221 $ 304,000
Gross unrealized losses - more than twelve months, available for sale $ 26,238 $ 29,367
Number of investment positions - available for sale 378 428
Fair value - available for sale $ 303,533 $ 354,929
Gross unrealized losses - available for sale $ 26,555 $ 30,066
Number of investment positions - more than twelve months, held to maturity 4 4
Fair value - more than twelve months, held to maturity $ 4,591 $ 4,591
Gross unrealized losses - more than twelve months, held to maturity $ 2,409 $ 2,409
Number of investment positions - held to maturity 4 4
Fair value - held to maturity $ 4,591 $ 4,591
Gross unrealized losses - held to maturity $ 2,409 $ 2,409
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Number of investment positions - less than twelve months, available for sale 1 7
Fair value - less than twelve months, available for sale $ 928 $ 8,008
Gross unrealized losses - less than twelve months, available for sale $ 1 $ 93
Number of investment positions - more than twelve months , available for sale 93 93
Fair value - more than twelve months, available for sale $ 58,330 $ 59,933
Gross unrealized losses - more than twelve months, available for sale $ 6,937 $ 8,261
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months, available for sale 3 11
Fair value - less than twelve months, available for sale $ 6,654 $ 19,211
Gross unrealized losses - less than twelve months, available for sale $ 60 $ 215
Number of investment positions - more than twelve months , available for sale 20 22
Fair value - more than twelve months, available for sale $ 5,127 $ 7,271
Gross unrealized losses - more than twelve months, available for sale $ 162 $ 285
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 2 7
Fair value - less than twelve months, available for sale $ 1,992 $ 4,830
Gross unrealized losses - less than twelve months, available for sale $ 9 $ 57
Number of investment positions - more than twelve months , available for sale 42 45
Fair value - more than twelve months, available for sale $ 104,127 $ 112,046
Gross unrealized losses - more than twelve months, available for sale $ 3,623 $ 4,703
Municipal Notes [Member]    
Number of investment positions - less than twelve months, available for sale   39
Fair value - less than twelve months, available for sale   $ 18,880
Gross unrealized losses - less than twelve months, available for sale   $ 334
Number of investment positions - more than twelve months , available for sale 187 196
Fair value - more than twelve months, available for sale $ 97,944 $ 103,201
Gross unrealized losses - more than twelve months, available for sale $ 15,381 $ 15,864
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months, available for sale 23  
Fair value - less than twelve months, available for sale $ 11,738  
Gross unrealized losses - less than twelve months, available for sale $ 247  
US Treasury and Government [Member]    
Number of investment positions - more than twelve months , available for sale 7 8
Fair value - more than twelve months, available for sale $ 16,693 $ 21,549
Gross unrealized losses - more than twelve months, available for sale $ 135 $ 254
Corporate Note Securities [Member]    
Number of investment positions - more than twelve months, held to maturity 4 4
Fair value - more than twelve months, held to maturity $ 4,591 $ 4,591
Gross unrealized losses - more than twelve months, held to maturity $ 2,409 $ 2,409