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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Feb. 21, 2020
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
May 05, 2020
May 08, 2012
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.0025   $ 0.0025   $ 0.0025    
Dividends, Common Stock, Total $ 1,300,000   $ 1,304,000   $ 1,209,000    
Average Realized Silver Price Per Ounce       $ 17.47      
Average Realized Silver Price, Minimum Dividend, Threshold (in dollars per share)       $ 30      
Klondex Mines Ltd [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 8.02 $ 8.02        
Warrants in Connection with Klondex Mines Acquisition [Member]              
Class of Warrant or Right, Issued During Period (in shares)     4,136,000        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1 1        
Warrants in Connection with Klondex Mines Acquisition Expiring April 2032 [Member]              
Class of Warrant or Right, Outstanding (in shares)   2,068,000 2,068,000        
Warrants in Connection with Klondex Mines Acquisition Expiring February 2029 [Member]              
Class of Warrant or Right, Outstanding (in shares)   2,068,000 2,068,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 1.57 $ 1.57        
Common Stock Repurchase Program [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)             20,000,000
Cumulative Stock Repurchased (in shares)   934,100 934,100        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)     $ 3.99        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)   19,100,000 19,100,000        
Common Stock Repurchase Program [Member] | Subsequent Event [Member]              
Treasury Stock, Shares, Acquired (in dollars per share)           $ 0  
Minimum [Member]              
Common Stock, Dividends, Per Share, Declared (in dollars per share)     $ 0.01        
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   2,800,062          
Share-based Payment Arrangement, Expense     $ 5,100,000        
Restricted Stock Units (RSUs) [Member]              
Share-based Payment Arrangement, Expense     $ 1,200,000   $ 1,600,000