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Note 9 - Share-based Compensation - Summary of Stock Options Outstanding (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Feb. 28, 2018
USD ($)
$ / shares
shares
Balance - beginning of year (in shares) | shares 17,551
Weighted average exercise price outstanding, beginning (in dollars per share) | $ / shares $ 3.24
Granted (in shares) | shares 3,402
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 3.86
Exercised (in shares) | shares (725)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 3.43
Expired (in shares) | shares (130)
Expired, weighted average exercise price (in dollars per share) | $ / shares $ 3.41
Forfeited (in shares) | shares (5)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 4.18
Balance - end of year (in shares) | shares 20,093
Weighted average exercise price outstanding, ending (in dollars per share) | $ / shares $ 3.35
Weighted-average remaining contractual term, outstanding (Year) 2 years 222 days
Aggregate intrinsic value, outstanding | $ $ 14,720
Vested and exercisable (in shares) | shares 15,542
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.02
Weighted-average remaining contractual term, vested and exercisable (Year) 1 year 219 days
Aggregate intrinsic value, vested and exercisable | $ $ 14,484