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Note 12 - Equity Incentive Plan - Stock Options and SAR’s Activity (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
Dec. 31, 2015
$ / shares
Options and SAR's outstanding at beginning of year 762,260 851,287
Options and SAR's outstanding at beginning of year, Weighted Average Exercise Price Per Share (in dollars per share) $ 18.75 $ 14.85
Options and SAR's Granted 354,275 111,625
Options and SAR's Granted, Weighted Average Exercise Price Per Share (in dollars per share) $ 40.77 $ 39.25
Options and SAR's Cancelled (58,841) (85,349)
Options and SAR's Cancelled, Weighted Average Exercise Price Per Share (in dollars per share) $ 30.05 $ 19.77
Options and SAR's Expired (3,310) (8,825)
Options and SAR's Expired, Weighted Average Exercise Price Per Share (in dollars per share) $ 11.37 $ 20.03
Options and SAR's Exercised (74,815) (106,478)
Options and SAR's Exercised, Weighted Average Exercise Price Per Share (in dollars per share) $ 15.46 $ 10.96
Stock options and SAR's outstanding at end of year 979,569 762,260
Stock options and SAR's outstanding at end of year (in dollars per share) $ 26.15 $ 18.75