Note 12 - Share-based Compensation - Summary of Stock Options Outstanding (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Nov. 30, 2020 USD ($) $ / shares shares
Balance (in shares) | shares	12,527
Weighted average exercise price outstanding, balance (in dollars per share) | $ / shares	$ 3.98
Granted (in shares) | shares	1,781
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 7.27
Exercised (in shares) | shares	(3,905)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 3.96
Balance (in shares) | shares	10,403
Weighted average exercise price outstanding, balance (in dollars per share) | $ / shares	$ 4.59
Outstanding, weighted-average remaining contractual term (Year)	2 years 3 months 25 days
Outstanding, aggregate intrinsic value | $	$ 56,113
Vested and exercisable as of November 30, 2020 (in shares) | shares	5,722
Vested and exercisable as of May 31, 2020, weighted average exercise price outstanding (in dollars per share) | $ / shares	$ 4.18
Vested and exercisable as of May 31, 2020, weighted-average remaining contractual term (Year)	1 year 7 months 13 days
Vested and exercisable as of May 31, 2020, aggregate intrinsic value | $	$ 33,146