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Note 7 - Additional Information on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Commercial And Industrial [Member]        
Average Recorded Investment $ 1,110 $ 1,357 $ 1,343 $ 1,369
Interest Income Recognized 12 20 25 34
Real Estate Construction Porfolio Segment [Member]        
Average Recorded Investment 1,368 2,806 1,508 2,969
Interest Income Recognized 24 80 49 100
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Average Recorded Investment 3,761 4,465 3,801 4,704
Interest Income Recognized 37 38 73 76
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]        
Average Recorded Investment 8,565 6,471 7,776 5,810
Interest Income Recognized 125 182 248 221
Consumer Portfolio Segment [Member]        
Average Recorded Investment 6 6 6 6
Interest Income Recognized
Average Recorded Investment 14,810 15,104 14,433 14,858
Interest Income Recognized $ 198 $ 320 $ 395 $ 431