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Note 10 - Stockholders' Equity (Details Textual)
12 Months Ended 34 Months Ended 80 Months Ended
Jul. 20, 2018
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
$ / item
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2018
USD ($)
$ / shares
$ / item
shares
Dec. 31, 2018
USD ($)
$ / shares
$ / item
shares
Feb. 19, 2019
$ / shares
Feb. 23, 2016
USD ($)
May 08, 2012
shares
Jun. 30, 2010
shares
Common Stock, Shares Authorized   750,000,000 750,000,000   750,000,000 750,000,000        
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.25 $ 0.25   $ 0.25 $ 0.25        
Common Stock, Shares, Issued, Total   482,603,937 399,176,425   482,603,937 482,603,937        
Treasury Stock, Shares, Ending Balance   5,226,791 4,529,450   5,226,791 5,226,791        
Common Stock, Shares, Outstanding, Ending Balance   482,603,937 399,176,425   482,603,937 482,603,937        
Average Realized Silver Price, Minimum Dividend, Threshold | $ / item   30     30 30        
Stock Issued During Period, Shares, New Issues   2,564,767     7,173,614          
Stock Issued During Period, Value, New Issues | $   $ 6,746,000 $ 9,611,000 $ 8,121,000 $ 24,500,000          
Payments for Brokerage Fees | $   $ 100,000     $ 600,000          
Preferred Stock, Shares Authorized   5,000,000 5,000,000   5,000,000 5,000,000        
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 0.25 $ 0.25   $ 0.25 $ 0.25        
Preferred Stock, Shares Outstanding, Ending Balance   157,816 157,816 157,816 157,816 157,816        
Percent of Shareholders' Consent Needed to Create or Issue Stock Ranking Senior to Series B Preferred Stock   66.67%     66.67% 66.67%        
Preferred Stock, Liquidation Preference, Value | $   $ 7,891,000 $ 7,891,000   $ 7,891,000 $ 7,891,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $   $ 4,500,000     $ 4,500,000 $ 4,500,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   2,689,468 2,095,318   2,689,468 2,689,468        
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards   3 years                
Class of Warrant or Right, Outstanding   0 0 0 0 0        
Klondex Mines Ltd [Member]                    
Stock Issued During Period, Shares, New Issues 75,276,176                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 8.02                  
Warrants in Connection with Klondex Mines Acquisition [Member]                    
Class of Warrant or Right, Issued During Period 4,136,000                  
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right 1                  
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member]                    
Class of Warrant or Right, Outstanding 2,068,000                  
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member]                    
Class of Warrant or Right, Outstanding 2,068,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 1.57                  
Satisfy Withholding Obligations [Member]                    
Treasury Stock Acquired, Average Cost Per Share | $ / shares   $ 3.86 $ 4.88              
Stock Repurchased During Period, Shares   697,341 588,240              
Stock Repurchased During Period, Value | $   $ 2,700,000 $ 2,900,000              
2010 Stock Incentive Plan [Member]                    
Allocated Share-based Compensation Expense, Total | $       $ 532,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                   20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   3,267,759     3,267,759 3,267,759        
2010 Stock Incentive Plan [Member] | Non-Employee Directors [Member]                    
Stock Issued During Period, Shares, Share-based Compensation, Gross       120,911            
Directors Stock Plan [Member]                    
Allocated Share-based Compensation Expense, Total | $   $ 593,000 $ 774,000 $ 271,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   3,120,707     3,120,707 3,120,707        
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator | $   $ 120,000                
Stock Issued During Period, Shares, Share-based Compensation, Gross   161,630 156,122 68,462            
Stock Compensation Plan [Member]                    
Allocated Share-based Compensation Expense, Total | $   $ 6,300,000 $ 6,300,000 $ 6,200,000            
Restricted Stock Units (RSUs) [Member]                    
Allocated Share-based Compensation Expense, Total | $   3,800,000                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $   5,900,000     $ 5,900,000 $ 5,900,000        
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member]                    
Allocated Share-based Compensation Expense, Total | $   5,200,000                
Performance Shares [Member]                    
Allocated Share-based Compensation Expense, Total | $   400,000 500,000              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $   $ 900,000     $ 900,000 $ 900,000        
Series B Preferred Stock [Member]                    
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares   $ 3.50                
Preferred Stock, Redemption Price Per Share | $ / shares   50     $ 50 $ 50        
Preferred Stock, Liquidation Preference Per Share | $ / shares   $ 50     $ 50 $ 50        
Preferred Stock, Liquidation Preference, Value | $   $ 7,900,000 $ 7,900,000   $ 7,900,000 $ 7,900,000        
Preferred Stock, Voting Rights   1                
Preferred Stock Conversion Price | $ / shares   $ 15.55     $ 15.55 $ 15.55        
Preferred Stock Conversion Rate | $ / shares   $ 3.2154     $ 3.2154 $ 3.2154        
Common Stock Repurchase Program [Member]                    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                 20,000,000  
Cumulative Stock Repurchased   934,100     934,100 934,100        
Treasury Stock Acquired, Average Cost Per Share | $ / shares           $ 3.99        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   19,100,000     19,100,000 19,100,000        
Common Stock Repurchase Program [Member] | Subsequent Event [Member]                    
Share Price | $ / shares             $ 2.92      
Minimum [Member]                    
Common Stock, Dividends, Per Share, Declared | $ / shares   $ 0.01                
Maximum [Member]                    
Common Stock, Aggregate Offering Price | $               $ 75,000,000