Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation (Parentheticals)	Jun. 15, 2015 $ / shares shares	Aug. 23, 2013 $ / shares shares	Jun. 02, 2013 $ / shares	Jun. 02, 2013 CAD / shares
Revett Mining Company Inc [Member]
Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation (Parentheticals) [Line Items]
Hecla stock, shares	6,252,646
Hecla stock, per share | $ / shares	$ 3.06
Aurizon Mines Ltd [Member]
Note 15 - Acquisitions (Details) - Preliminary Purchase Price Allocation (Parentheticals) [Line Items]
Hecla stock, shares		56,997,790
Hecla stock, per share | (per share)		$ 3.83	$ 4.32	CAD 4.47