Note 12 - Share-based Compensation (Tables)

12 Months Ended

Nov. 30, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Years ended November 30,
	2020		2019		2018
Stock options	$	4,309	$	3,694	$	3,767
Performance share unit plan		2,547		2,320		3,783
Deferred share unit plan		201		162		177
	$	7,057	$	6,176	$	7,727

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Number of stock options (thousands)			Weighted- average exercise price per share		Weighted- average remaining contractual term (years)		Aggregate intrinsic value
November 30, 2019		12,527		$	3.98
Granted		1,781			7.27
Exercised		(3,905	)		3.96
November 30, 2020		10,403		$	4.59		2.32	$	56,113
Vested and exercisable as of November 30, 2020		5,722		$	4.18		1.62	$	33,146

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Years ended November 30,
	2020			2019			2018
Weighted-average assumptions used to value stock option awards:
Expected volatility		46.1	%		46.9	%		50	%
Expected term of options (years)		4			4			3
Expected dividend rate		—			—			—
Risk-free interest rate		1.5	%		2.7	%		1.8	%
Expected forfeiture rate		3.1	%		3.1	%		2.3	%
Weighted-average grant-date fair value	$	2.70		$	1.46		$	1.35
Intrinsic value of options exercised	$	24,137		$	20,527		$	3,744
Cash received from options exercised	$	—		$	—		$	—

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

	Number of PSU awards (thousands)			Weighted- average grant day fair value per award		Aggregate intrinsic value
November 30, 2019		1,664		$	3.76
Granted		452			6.97
Vested		(648	)		3.85
Performance adjustment		216			3.85
November 30, 2020		1,684		$	4.59	$	24,107

Other PSU-related Information [Table Text Block]

	Years ended November 30,
	2020			2019			2018
Performance multiplier on PSUs vested		150	%		82	%		—	%
Common shares issued (thousands)		648			438			—
Total fair value of common shares issued	$	2,855		$	1,607		$	—
Withholding tax paid on PSUs vested	$	1,652		$	1,197		$	—