Note 13 - Merger with Revett (Details) - Preliminary Purchase Price Allocation (Parentheticals) - Revett Mining Company, Inc. [Member]	Jun. 15, 2015 $ / shares shares
Note 13 - Merger with Revett (Details) - Preliminary Purchase Price Allocation (Parentheticals) [Line Items]
Hecla stock, per share	$ 3.06
Hecla stock, shares \| shares	6,252,646

Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration