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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment of Loans Based on Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Individually evaluated for impairment $ 34   $ 98      
Collectively evaluated for impairment 7,367   6,630      
Total ending allowance balance 7,401 $ 8,013 6,728 $ 7,639 $ 7,996 $ 7,499
Loans individually evaluated for impairment 20,501   12,618      
Loans collectively evaluated for impairment 755,625   764,434      
Total ending loans balance 776,126   777,052      
Residential Portfolio Segment [Member]            
Individually evaluated for impairment 7        
Collectively evaluated for impairment 1,966   1,583      
Total ending allowance balance 1,973 2,079 1,583 1,886 2,059 1,470
Loans individually evaluated for impairment 1,954   1,667      
Loans collectively evaluated for impairment 309,086   302,412      
Total ending loans balance 311,040   304,079      
Commercial Real Estate Portfolio Segment [Member]            
Individually evaluated for impairment 27   98      
Collectively evaluated for impairment 2,195   2,088      
Total ending allowance balance 2,222 2,452 2,186 2,392 2,423 2,978
Loans individually evaluated for impairment 11,252   3,835      
Loans collectively evaluated for impairment 210,262   212,525      
Total ending loans balance 221,514   216,360      
Commercial and Industrial Portfolio Segment [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment 1,095   1,063      
Total ending allowance balance 1,095 1,315 1,063 1,242 1,373 1,024
Loans individually evaluated for impairment 7,289   7,116      
Loans collectively evaluated for impairment 95,007   106,127      
Total ending loans balance 102,296   113,243      
Consumer Portfolio Segment [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment 2,111   1,896      
Total ending allowance balance 2,111 $ 2,167 1,896 $ 2,119 $ 2,141 $ 2,027
Loans individually evaluated for impairment 6        
Loans collectively evaluated for impairment 141,270   143,370      
Total ending loans balance $ 141,276   $ 143,370