Investments (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2017 USD ($)	May 31, 2016 USD ($)	May 31, 2017 USD ($) shares	May 31, 2017 CAD shares	May 31, 2016 USD ($)
Noncash or Part Noncash Acquisition, Investments Acquired Shares | shares			5,000,000	5,000,000
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Warrants Issued | shares			1,000,000	1,000,000
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 7,800		$ 7,800
Sale of Stock, Number of Shares Issued in Transaction | shares			570,000	570,000
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ 70	$ 0	$ (1,169)		$ 0
Sale of Stock, Consideration Received on Transaction			$ 900
Sunward Investments [Member]
Class of Warrant or Right, Grants in Period, Exercise Price | CAD				CAD 3.50
Mineral property acquisition	100.00%		100.00%
Noncash or Part Noncash Divestiture, Amount of Consideration Received			$ 8,100
Noncash or Part Noncash Acquisition Noncash Financial or Equity Instrument Consideration Warrants Value			$ 300