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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