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Note 3 - Loans - Modified in a Troubled Debt Restructuring (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Number of contracts 1
Pre-modification $ 91
Post-modification $ 91
Real Estate Portfolio Segment [Member] | Residential [Member]        
Number of contracts 1
Pre-modification $ 91
Post-modification $ 91