Note 16 - Acquisitions - Preliminary Purchase Price Allocation (Details) (Parentheticals) - $ / shares			1 Months Ended
	Jul. 20, 2018	Sep. 13, 2016	Jun. 30, 2015
Klondex Mines Ltd [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	75,276,176
Stock Issued, per share (in dollars per share)	$ 3.22
Business Acquisition, Share Price	$ 2.24
Revett Mining Company, Inc. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		8,309,006	8,309,006
Business Acquisition, Share Price		$ 5.79