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Note 5 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Unused Commitments to Extend Credit $ 147,300 $ 111,400
Construction Loan Payable [Member]    
Unused Commitments to Extend Credit 43,600  
Standby Letters of Credit [Member]    
Unused Commitments to Extend Credit $ 631 $ 126