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Note 13 - Acquisition of Klondex Mines Ltd. (Details Textual) |  |  | 3 Months Ended | 9 Months Ended | 43 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2018 USD ($) $ / shares shares | Jul. 19, 2018 shares | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2018 shares
Common Stock, Shares, Issued, Total | shares |  |  |  | 496,538,038 | 496,538,038 | 487,830,728
Common Stock, Shares, Outstanding, Ending Balance | shares |  |  |  | 490,250,767 | 490,250,767 |
Stock Issued During Period, Shares, New Issues | shares |  |  |  | 0 | 7,173,614 |
Warrants in Connection with Klondex Mines Acquisition [Member] |  |  |  |  |  |
Class of Warrant or Right, Issued During Period | shares | 4,136,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares | 1 |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member] |  |  |  |  |  |
Class of Warrant or Right, Outstanding | shares | 2,068,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 8.02 |  |  |  |  |
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member] |  |  |  |  |  |
Class of Warrant or Right, Outstanding | shares | 2,068,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 1.57 |  |  |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |  |
Common Stock, Shares, Issued, Total | shares | 182,048,945 | 180,499,319 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | shares | 182,048,945 | 180,499,319 |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 1,549,626 |  |  |  |
Klondex Mines Ltd [Member] |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 2.27 |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |  |
Business Combination, Consideration, Cash Alternative, Price Per Share | $ / shares | $ 2.47 |  |  |  |  |
Business Combination, Consideration, Share Alternative, Share Exchange Rate | 0.6272 |  |  |  |  |
Business Combination Consideration, Combined Alternative, Price Per Share | $ / shares | $ 0.8411 |  |  |  |  |
Business Combination Consideration, Combined Alternative, Share Exchange Rate | 0.4136 |  |  |  |  |
Payments to Acquire Businesses, Gross | $ | $ 161,704,000 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 75,276,176 |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 75,276,176 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 8.02 |  |  |  |  |
Share-based Payment Arrangement, Cash Used to Settle Award | $ | $ 2,000,000.0 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ | 242,389,000 |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ | 413,923,000 |  |  |  |  |
Business Combination, Subscrition of New Formed Company, Value | $ | 7,000,000.0 |  |  |  |  |
Business Combination, Settlement of Certain Equity Compensation Value | $ | 1,500,000 |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment | $ |  |  | $ 2,800,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable and Accrued Liabilities | $ |  |  | 2,100,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Deferred Tax Liability | $ |  |  | 700,000 |  |  |
Weighted Average Gold Price Per Ounce | $ |  |  | $ 1,280 | $ 1,345 | $ 1,345 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | $ | 510,015,000 |  |  | $ 524,800,000 | $ 524,800,000 |
Klondex Mines Ltd [Member] | Hecla Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Issued During Period, Value | $ | 9,800,000 |  |  |  |  |
Klondex Mines Ltd [Member] | Maximum [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ | $ 153,200,000 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 75,276,176 |  |  |  |  |

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