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Note 6 - Pre-tax Effect of Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Interest Expense [Member]        
Interest rate swaps $ (55) $ (55) $ (166)
Interest rate swaps 216 235 587
Interest rate swaps   $ (34) $ (34) $ (101)