Note 13 - Share-based Compensation - Summary of Stock Options Outstanding (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Nov. 30, 2017 USD ($) $ / shares shares
Balance - beginning of year (in shares) | shares	19,829
Weighted average exercise price outstanding, beginning (in dollars per share) | $ / shares	$ 3.59
Granted (in shares) | shares	3,545
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 4.58
Exercised (in shares) | shares	(3,554)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 4.54
Expired (in shares) | shares	(2,197)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 9.42
Forfeited (in shares) | shares	(72)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 4.60
Balance - end of year (in shares) | shares	17,551
Weighted average exercise price outstanding, ending (in dollars per share) | $ / shares	$ 3.24
Weighted-average remaining contractual term, outstanding (Year)	2 years 109 days
Aggregate intrinsic value, outstanding | $	$ 13,837
Vested and exercisable (in shares) | shares	14,058
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 2.98
Weighted-average remaining contractual term, vested and exercisable (Year)	1 year 350 days
Aggregate intrinsic value, vested and exercisable | $	$ 13,837