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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 15, 2018
USD ($)
Number Of Wholly Owned Trusts   1 1    
Reclassification of Accumulated Other Comprehensive Income Due to Tax Rate Change        
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   4.00% 3.00%    
Percentage of Portfolio Secured by Real Estate   81.00%      
Recognize Tax Benefit in Percentage   50.00%      
Number of Operating Segments   1      
Advertising Expense   $ 47 $ 61 $ 171  
Operating Lease, Right-of-Use Asset         $ 4,800
Operating Lease, Liability, Total         $ 4,800
Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life   3 years      
Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life   7 years      
Building [Member]          
Property, Plant and Equipment, Useful Life   39 years      
AOCI Attributable to Parent [Member]          
Reclassification of Accumulated Other Comprehensive Income Due to Tax Rate Change   $ (52)      
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]          
Reclassification of Accumulated Other Comprehensive Income Due to Tax Rate Change $ (52)        
Retained Earnings [Member]          
Reclassification of Accumulated Other Comprehensive Income Due to Tax Rate Change   $ 52      
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]          
Reclassification of Accumulated Other Comprehensive Income Due to Tax Rate Change $ 52