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Note 1 - Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss $ 16,269   $ 15,697 $ 16,484 $ 16,621
Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss   $ 15,697      
Allowance for credit losses on off-balance sheet credit exposures   798      
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
Financing Receivable, Allowance for Credit Loss   16,215      
Allowance for credit losses on off-balance sheet credit exposures   1,071      
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Financing Receivable, Allowance for Credit Loss   518 $ 518    
Allowance for credit losses on off-balance sheet credit exposures   $ 273