Note 15 - Acquisitions (Details)	0 Months Ended		1 Months Ended	12 Months Ended				0 Months Ended
	Jun. 02, 2013 USD ($)	Jun. 02, 2013 CAD	Apr. 30, 2013 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 Asset Retirement Obligation [Member] USD ($)	Dec. 31, 2014 Plant and Equipment [Member] USD ($)	Dec. 31, 2014 Development and Other Mineral Interests [Member] USD ($)	Jun. 02, 2013 In the Money Stock Options [Member]	Jun. 02, 2013 Aurizon Mines Ltd [Member] USD ($)	Jun. 02, 2013 Aurizon Mines Ltd [Member] CAD
Note 15 - Acquisitions (Details) [Line Items]
Business Acquisition Per Share Consideration				$ 3.83					$ 4.32	4.47
Business Acquisition, Share Price (in Dollars per share)										4.75
Business Acquisition Per Share Issued (in Shares)									0.9953	0.9953
Potential Business Acquisition Per Share Price (in Dollars per share)										3.11
Business Acquisition Cost Sensitivity to Change in Share Price (in Dollars per share)	$ 3.00
Potential Business Acquitision Shares Issued (in Shares)	0.3442	0.3442
Business Acquisition Shares Outstanding of Entity Acquired (in Shares)	164,838,377	164,838,377
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)	56,997,790	56,997,790						747,132
Business Acquisition Shares Issued and Outstanding of Acquired Entity (in Shares)	165,585,509	165,585,509
Payments to Acquire Businesses, Gross	$ 496,200,000	514,500,000		$ 496,211,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	218,300,000	226.3		218,302,000
Business Combination, Consideration Transferred	714,500,000	740,800,000		714,513,000
Exchange Rate	0.9645	0.9645
Share Price	$ 3.83	3.97		$ 2.79
Proceeds from Notes Payable			490,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				$ 715,391,000	$ 11,100,000	$ 127,800,000	$ 576,500,000