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Note 11 - Stock Option (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Balance of Outstanding Options at January 1, 2015 (in shares) | shares 3,182,976
Balance of Outstanding Options at January 1, 2015 (in dollars per share) | $ / shares $ 19.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 484,838
Granted (in dollars per share) | $ / shares $ 27.10
Exercised (in shares) | shares (182,199)
Exercised (in dollars per share) | $ / shares $ 12.47
Forfeited (in shares) | shares (10,500)
Forfeited (in dollars per share) | $ / shares $ 28.13
Balance of Outstanding Options at December 31, 2015 (in shares) | shares 3,475,115
Balance of Outstanding Options at December 31, 2015 (in dollars per share) | $ / shares $ 20.95
Balance of Outstanding Options at December 31, 2015 5 years 281 days
Balance of Outstanding Options at December 31, 2015 | $ $ 12,011,648
Expected to vest after December 31, 2015 (in shares) | shares 1,851,300
Expected to vest after December 31, 2015 (in dollars per share) | $ / shares $ 25.97
Expected to vest after December 31, 2015 7 years 193 days
Expected to vest after December 31, 2015 | $ $ 559,698
Vested and exercisable at December 31, 2015 (in shares) | shares 1,555,242
Vested and exercisable at December 31, 2015 (in dollars per share) | $ / shares $ 14.78
Vested and exercisable at December 31, 2015 3 years 222 days
Vested and exercisable at December 31, 2015 | $ $ 11,409,144