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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Retained Earnings (Accumulated Deficit) $ 180,724     $ 179,931      
Deferred Income Tax Assets, Net 23,206     22,130      
Financing Receivable, Allowance for Credit Loss 16,118 $ 16,319   15,697 $ 15,897 $ 16,420 $ 16,621
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 4,100            
Financing Receivable, Accrued Interest, after Allowance for Credit Loss $ 9,700            
Accounting Standards Update 2016-13 [Member]              
Financing Receivable, Allowance for Credit Loss     $ 15,697        
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]              
Retained Earnings (Accumulated Deficit)     (603)        
Deferred Income Tax Assets, Net     188        
Financing Receivable, Allowance for Credit Loss     518 $ 518      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | OBS Credit Exposures [Member]              
Financing Receivable, Allowance for Credit Loss     $ 273