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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
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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

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