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Note 13 - Acquisitions | 6 Months Ended
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Jun. 30, 2016
Notes to Financial Statements |
Business Combination Disclosure [Text Block] | Note 13. Acquisitions Proposed Acquisition of Mines Management, Inc. On May 23, 2016, we and Mines Management, Inc. ("Mines Management") entered into a merger agreement pursuant to which we would acquire all of the issued and outstanding common stock of Mines Management. Mines Management holds 100% ownership of the Montanore project in Northwest Montana, a significant undeveloped silver and copper deposit located approximately ten miles from our Rock Creek project. In the proposed merger, each outstanding common share of Mines Management would be exchanged for 0.2218 of a share of our common stock, which had an estimated value of $0.94 per Mines Management common share based on the closing price of Hecla's common stock of $4.24 per share on May 20, 2016, the last full trading day before the merger agreement was entered into. The actual value of consideration transferred will be based on the market price of Hecla's common stock on the date the merger is consummated. Based on the closing price of Hecla stock of $6.55 per share on August 2, 2016, total consideration would be $59.1 million. A 10% change in the price per share of Hecla stock from its closing price on August 2, 2016 would result in a $5.9 million change in the amount of consideration transferred in the merger. Estimated consideration is based on us issuing approximately 9,030,010 shares of our common stock to Mines Management shareholders in the merger. All consideration given to Mines Management stockholders will be in newly issued Hecla stock. The proposed merger is subject to approval by Mine Management's stockholders. No assurance can be given as to whether the merger will be approved and consummated. In May 2016, we entered into a term loan and security agreement with Mines Management pursuant to which we agreed to provide one or more secured loans to Mines Management in an aggregate amount not to exceed $2.3 million. The loans bear interest at a rate per annum equal to LIBOR plus 5% and will be due and payable the earlier of September 30, 2016, the date the merger is consummated, or the date of other specified events. The loans are secured by substantially all of the assets of Mines Management. The balance of the note as of June 30, 2016 was $1.4 million. Takeover Bid of Dolly Varden Silver Corporation On June 27, 2016, we announced a takeover bid for all of the outstanding shares of Dolly Varden Silver Corporation ("Dolly Varden") not owned by us and our affiliates for cash of CAD$0.69 per share. Dolly Varden owns 100% of the Dolly Varden historic silver property in Northwestern British Columbia, Canada. Our wholly owned subsidiary owns 2,620,291 Dolly Varden shares and warrants to purchase 1,250,000 Dolly Varden shares, representing approximately 19.8% of Dolly Varden's shares outstanding on a partially diluted basis. Based on Dolly Varden's outstanding shares and options and warrants to acquire Dolly Varden shares, and excluding shares and warrants held by us and our affiliates, total consideration would be approximately CAD$13.6 million. In late July 2016, we withdrew the bid due to the failure of a required condition precedent to its consummation.

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