Note 15 - Acquisitions - Preliminary Purchase Price Allocation (Details) - USD ($)	Sep. 13, 2016	Jun. 15, 2015	Jun. 30, 2015
Mines Management [Member]
Cash	$ 4,025,000
Hecla stock issued (8,309,006 shares at $5.79 per share)	48,109,000
Total consideration	52,134,000
Cash	94,000
Property, plants, equipment and mineral interests	74,320,000
Restricted cash	1,185,000
Other assets	329,000
Total assets	75,928,000
Accounts payable and accrued liabilities	2,357,000
Deferred tax liability	20,313,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability	1,124,000
Total liabilities	23,794,000
Net assets	52,134,000
Consideration:
Payments to Acquire Businesses, Gross	4,025,000
Hecla stock issued (6,252,646 shares at $3.06 per share)	48,109,000
Total consideration	52,134,000
Assets:
Cash	94,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	74,320,000
Other assets	329,000
Total assets	75,928,000
Liabilities:
Accounts payable and accrued liabilities	2,357,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability	1,124,000
Total liabilities	23,794,000
Net assets	$ 52,134,000
Revett Mining Company, Inc. [Member]
Cash		$ 949,000
Hecla stock issued (8,309,006 shares at $5.79 per share)		19,133,000
Total consideration		20,082,000
Cash		140,000
Property, plants, equipment and mineral interests		17,609,000
Other assets		280,000
Total assets		42,631,000
Accounts payable and accrued liabilities		975,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability		17,513,000	$ 17,500,000
Total liabilities		22,549,000
Net assets		20,082,000
Consideration:
Payments to Acquire Businesses, Gross		949,000
Hecla stock issued (6,252,646 shares at $3.06 per share)		19,133,000
Total consideration		20,082,000
Assets:
Cash		140,000
Accounts receivable		137,000
Inventory - supplies		472,000
Deferred tax assets		7,193,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		17,609,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reclamation Insurance Asset		16,800,000	16,800,000
Other assets		280,000
Total assets		42,631,000
Liabilities:
Accounts payable and accrued liabilities		975,000
Notes payable		4,061,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Reclamation Liability		17,513,000	$ 17,500,000
Total liabilities		22,549,000
Net assets		$ 20,082,000