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Note 9 - Share-based Compensation - Summary of Stock Options Outstanding (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
May 31, 2017
USD ($)
$ / shares
shares
Balance - beginning of year (in shares) | shares 19,829
Weighted average exercise price outstanding, beginning (in dollars per share) | $ / shares $ 3.33
Granted (in shares) | shares 3,545
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 4.58
Exercised (in shares) | shares (546)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 4.18
Weighted average exercise price outstanding, ending (in dollars per share) | $ / shares $ 3.18
Weighted-average remaining contractual term, outstanding (Year) 2 years 164 days
Aggregate intrinsic value, outstanding | $ $ 15,769
Vested and exercisable (in shares) | shares 17,623
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 2.96
Weighted-average remaining contractual term, vested and exercisable (Year) 2 years 36 days
Aggregate intrinsic value, vested and exercisable | $ $ 17,052
Expired/Forfeited (in shares) | shares (1,683)
Expired/Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 7.57
Balance - end of year (in shares) | shares 21,145