Note 12 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Loss before income taxes	$ (38,284)	$ (33,569)	$ (31,799)
Combined federal and provincial statutory tax rate	26.00%	26.00%	26.00%
Income tax recovery based on statutory income tax rates	$ (9,954)	$ (8,728)	$ (8,268)
Reconciling items:
Effect of future statutory tax rate change	(1,679)
Non-deductible expenditures	2,485	2,607	1,906
Foreign accrual property income	(439)	862	1,269
Effect of different statutory tax rates on earnings or losses of subsidiaries	(2,690)	(2,218)	(2,619)
Effect of tax losses expired	8	6	3,878
Change in valuation allowance on deferred tax assets	13,025	7,668	3,264
Other	(24)	80	723
Income tax expense	$ 732	$ 277	$ 153