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Note 7 - Loans and Related Allowance for Loan Losses - Additional Information on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Average recorded investment $ 14,683 $ 14,810 $ 14,258 $ 14,433
Interest income recognized 181 198 375 395
Commercial And Industrial [Member]        
Average recorded investment 2,228 1,110 1,889 1,343
Interest income recognized 57 12 141 25
Real Estate Construction Porfolio Segment [Member]        
Average recorded investment 676 1,368 877 1,508
Interest income recognized 1 24 1 49
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Average recorded investment 3,131 3,761 3,264 3,801
Interest income recognized 28 37 50 73
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]        
Average recorded investment 8,643 8,565 8,223 7,775
Interest income recognized 95 125 183 248
Consumer Portfolio Segment [Member]        
Average recorded investment 5 6 5 6
Interest income recognized