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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Jan. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operating Lease, Right-of-Use Asset   $ 3,464
Operating Lease, Right-of-use Assets, Reduction for Amounts Recognized Previously $ 458    
Minimum Risk Rating Range for Loan and Lease Losses   1  
Maximum Risk Rating Range for Loan and Lease Losses   8  
Percentage of Unallocated Allowance Amount out of Allowance for Loan and Lease Losses   3.00% 4.00%
Percentage of Portfolio Secured by Real Estate   83.00%  
Recognize Tax Benefit in Percentage   50.00%  
Number of Operating Segments   1  
Advertising Expense   $ 160 $ 47
Building [Member]      
Property, Plant and Equipment, Useful Life   39 years  
Maximum [Member]      
Percentage of Unallocated Allowance Amount out of Allowance for Loan and Lease Losses     4.00%
Maximum [Member] | Equipment [Member]      
Property, Plant and Equipment, Useful Life   7 years  
Minimum [Member] | Equipment [Member]      
Property, Plant and Equipment, Useful Life   3 years  
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset 4,400    
Operating Lease, Liability, Total $ 4,400