Note 13 - Merger with Revett (Details) - Preliminary Purchase Price Allocation - Jun. 15, 2015 - Revett Mining Company, Inc. [Member] - USD ($) $ in Thousands	Total
Consideration:
Cash	$ 949
Hecla stock issued (6,252,646 shares at $3.06 per share)	19,133
Total consideration	20,082
Assets:
Cash	140
Accounts receivable	137
Inventory - supplies	629
Deferred tax assets	7,137
Property, plants, equipment and mineral interests	19,052
Reclamation insurance	16,800
Other assets	280
Total assets	44,175
Liabilities:
Accounts payable and accrued liabilities	1,218
Notes payable	4,061
Non-current reclamation liability	18,814
Total liabilities	24,093
Net assets	$ 20,082