Note 14 - Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Thousands	Nov. 30, 2020 USD ($)
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	$ 497,571
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2024 [Member]
Net operating loss carry-forwards	1,032
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2025 [Member]
Net operating loss carry-forwards	1,246
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2026 [Member]
Net operating loss carry-forwards	13,382
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2027 [Member]
Net operating loss carry-forwards	18,493
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2028 [Member]
Net operating loss carry-forwards	85
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2029 [Member]
Net operating loss carry-forwards	11,223
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2030 [Member]
Net operating loss carry-forwards	10,916
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2031 [Member]
Net operating loss carry-forwards	16,580
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2032 [Member]
Net operating loss carry-forwards	309,772
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2033 [Member]
Net operating loss carry-forwards	14,529
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2034 [Member]
Net operating loss carry-forwards	15,607
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2035 [Member]
Net operating loss carry-forwards	16,383
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2036 [Member]
Net operating loss carry-forwards	14,764
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2037 [Member]
Net operating loss carry-forwards	14,111
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2038 [Member]
Net operating loss carry-forwards	0
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2039 [Member]
Net operating loss carry-forwards	0
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Indefinite [Member]
Net operating loss carry-forwards	39,448
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2040 [Member]
Net operating loss carry-forwards	7,365
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expiring in 2040 [Member]
Net operating loss carry-forwards	0
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	155,056
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2024 [Member]
Net operating loss carry-forwards	0
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2025 [Member]
Net operating loss carry-forwards	0
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2026 [Member]
Net operating loss carry-forwards	19,166
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2027 [Member]
Net operating loss carry-forwards	1,861
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2028 [Member]
Net operating loss carry-forwards	0
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2029 [Member]
Net operating loss carry-forwards	12,062
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2030 [Member]
Net operating loss carry-forwards	16,051
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2031 [Member]
Net operating loss carry-forwards	15,975
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2032 [Member]
Net operating loss carry-forwards	19,496
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2033 [Member]
Net operating loss carry-forwards	14,712
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2034 [Member]
Net operating loss carry-forwards	10,585
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2035 [Member]
Net operating loss carry-forwards	9,666
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2036 [Member]
Net operating loss carry-forwards	9,512
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2037 [Member]
Net operating loss carry-forwards	6,329
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2038 [Member]
Net operating loss carry-forwards	6,433
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2039 [Member]
Net operating loss carry-forwards	5,843
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Indefinite [Member]
Net operating loss carry-forwards	$ 0