The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revett Mining Company Inc [Member]
Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) [Line Items]
Diluted income (loss) per common share	$ (0.24)	$ (0.12)	$ (0.11)
Aurizon Mines Ltd [Member]
Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (Parentheticals) [Line Items]
Diluted income (loss) per common share			$ (0.03)