Note 12 - Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Thousands	Nov. 30, 2017 USD ($)
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	$ 458,210
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	14,198
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	168,144
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2024 [Member]
Net operating loss carry-forwards
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2025 [Member]
Net operating loss carry-forwards
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2026 [Member]
Net operating loss carry-forwards	25,382
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2027 [Member]
Net operating loss carry-forwards	4,077
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2028 [Member]
Net operating loss carry-forwards	538
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2029 [Member]
Net operating loss carry-forwards	12,679
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2030 [Member]
Net operating loss carry-forwards	18,242
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2031 [Member]
Net operating loss carry-forwards	17,115
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2032 [Member]
Net operating loss carry-forwards	29,984
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2033 [Member]
Net operating loss carry-forwards	22,423
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2034 [Member]
Net operating loss carry-forwards	10,383
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2035 [Member]
Net operating loss carry-forwards	6,872
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2036 [Member]
Net operating loss carry-forwards	9,433
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Expiring in 2037 [Member]
Net operating loss carry-forwards	$ 11,016