Note 13 - Merger with Revett (Details) $ in Thousands		3 Months Ended	6 Months Ended
	Jun. 15, 2015 USD ($) shares	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 15, 2015 CAD / shares
Note 13 - Merger with Revett (Details) [Line Items]
Share Price (in Dollars per share) | CAD / shares				CAD 3.06
Business Combination, Acquisition Related Costs		$ 2,147	$ 2,147
Revett Mining Company, Inc. [Member]
Note 13 - Merger with Revett (Details) [Line Items]
Ownership Percentage	100.00%
Number of Properties	2
Insurance Policy	$ 16,800
Revett Mining Company, Inc. [Member]
Note 13 - Merger with Revett (Details) [Line Items]
Business Combination, Consideration Transferred	20,082
Payments to Acquire Businesses, Gross	949
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 19,100
Business Acquistion, Number of Common Stock Shares Exchanged for Each Share of Acquiree Common Stock (in Shares) | shares	0.1622
Business Acquisition, Common Shares Outstanding of Acquiree (in Shares) | shares	38,548,989
Business Acquisition, Shares Owned by Subsidary, Number of Shares Cancelled (in Shares) | shares	725,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) | shares	6,252,646
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	$ 19,052
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability	18,814
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reclamation Insurance Asset	16,800
Business Combination, Acquisition Related Costs	2,300
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (1,700)	$ (1,700)
Revett Mining Company, Inc. [Member] | Plant and Equipment [Member]
Note 13 - Merger with Revett (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,100
Revett Mining Company, Inc. [Member] | Land [Member]
Note 13 - Merger with Revett (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,600
Revett Mining Company, Inc. [Member] | Mineral Interests [Member]
Note 13 - Merger with Revett (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	$ 10,300