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Note 11 - Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Shares issuable under options - Beginning of period, number of options (in shares) | shares 1,211,250
Shares issuable under options - Beginning of period, weighted average exercise price (in dollars per share) | $ / shares $ 18.51
Granted, number of options (in shares) | shares 328,500
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 36.08
Exercised, number of options (in shares) | shares (133,600)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 14.12
Forfeited, number of options (in shares) | shares (54,750)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 22.58
Shares issuable under options - December 31, 2016, number of options (in shares) | shares 1,351,400
Shares issuable under options - December 31, 2016, weighted average exercise price (in dollars per share) | $ / shares $ 23.05
Shares issuable under options - December 31, 2016, weighted average remaining contractual life (Year) 2 years 182 days
Shares issuable under options - December 31, 2016, weighted average remaining contractual life | $ $ 33,011
Options exercisable - End of period, number of options (in shares) | shares 505,000
Options exercisable - End of period, weighted average exercise price (in dollars per share) | $ / shares $ 17.49
Options exercisable - End of period, weighted average remaining contractual life (Year) 1 year 219 days
Options exercisable - End of period, weighted average remaining contractual life | $ $ 15,143