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Note 8 - Fair Value Measurements - Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Available-for-sale securities $ 380,785 $ 420,862
Fair Value, Recurring [Member]    
Available-for-sale securities 380,785 420,862
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale securities 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale securities 380,785 420,862
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale securities 0 0
US Government Agencies Debt Securities [Member]    
Available-for-sale securities 26,946 31,533
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 26,946 31,533
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale securities 0 0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale securities 26,946 31,533
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale securities 0 0
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 151,987 171,894
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 151,987 171,894
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale securities 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale securities 151,987 171,894
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale securities 0 0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities 201,852 217,435
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 201,852 217,435
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale securities 0 0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale securities 201,852 217,435
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale securities $ 0 $ 0