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Note 13 - Stock Options and SAR’s Activity (Details)
 12 Months Ended
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Options and SAR's outstanding at beginning of year 851,287 1,513,326
Options and SAR's outstanding at beginning of year, Weighted Average Exercise Price Per Share (in dollars per share) $ 14.85 $ 9.14
Options and SAR's Granted 111,625 179,240
Options and SAR's Granted, Weighted Average Exercise Price Per Share (in dollars per share) $ 39.25 $ 35.62
Options and SAR's Cancelled (85,349) (53,325)
Options and SAR's Cancelled, Weighted Average Exercise Price Per Share (in dollars per share) $ 19.77 $ 23.73
Options and SAR's Expired (8,825) (24,292)
Options and SAR's Expired, Weighted Average Exercise Price Per Share (in dollars per share) $ 20.03 $ 9.87
Options and SAR's Exercised (106,478) (763,662)
Options and SAR's Exercised, Weighted Average Exercise Price Per Share (in dollars per share) $ 10.96 $ 7.95
Options and SAR's outstanding at end of year 762,260 851,287
Options and SAR's outstanding at end of year, Weighted Average Exercise Price Per Share (in dollars per share) $ 18.75 $ 14.85