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Note 15 - Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
Consideration: |  |  |  |
Cash |  | $ | 4,025 |
Hecla stock issued (8,309,006 shares at $5.79 per share) |  |  | 48,109 |
Total consideration |  | $ | 52,134 |
Fair value of net assets acquired: |  |  |  |
Assets: |  |  |  |
Cash |  | $ | 94 |
Property, plants, equipment and mineral interests |  |  | 74,320 |
Restricted cash |  |  | 1,185 |
Other assets |  |  | 329 |
Total assets |  |  | 75,928 |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  | 2,357 |
Deferred tax liability |  |  | 20,313 |
Non-current reclamation liability |  |  | 1,124 |
Total liabilities |  |  | 23,794 |
Net assets |  | $ | 52,134 |
Consideration: |  |  |  |
Cash |  | $ | 949 |
Hecla stock issued (6,252,646 shares at $3.06 per share) |  |  | 19,133 |
Total consideration |  | $ | 20,082 |
Fair value of net assets acquired: |  |  |  |
Assets: |  |  |  |
Cash |  | $ | 140 |
Accounts receivable |  |  | 137 |
Inventory - supplies |  |  | 472 |
Deferred tax assets |  |  | 7,193 |
Property, plants, equipment and mineral interests |  |  | 17,609 |
Reclamation insurance |  |  | 16,800 |
Other assets |  |  | 280 |
Total assets |  |  | 42,631 |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  | 975 |
Notes payable |  |  | 4,061 |
Non-current reclamation liability |  |  | 17,513 |
Total liabilities |  |  | 22,549 |
Net assets |  | $ | 20,082 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Year Ended December 31, |
(in thousands, except per share amounts) |  | 2016 |  |  | 2015 |
|  | (unaudited) |
Sales of products |  | $ | 645,957 |  |  | $ | 443,567 |
Net income (loss) |  |  | 68,778 |  |  |  | (89,806 | )
Income (loss) applicable to common shareholders |  |  | 68,226 |  |  |  | (90,357 | )
Basic and diluted income (loss) per common share |  |  | 0.17 |  |  |  | (0.24 | )
|  | Year Ended December 31, |
(in thousands, except per share amounts) |  | 2015 |
|  | (unaudited) |
Sales of products |  | $ | 445,703 |
Net loss |  |  | (89,118 | )
Loss applicable to common stockholders |  |  | (89,670 | )
Basic and diluted loss per common share |  |  | (0.24 | )

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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