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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 40 Months Ended
Aug. 05, 2019
Jun. 30, 2019
Apr. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Feb. 23, 2016
May 08, 2012
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation             714,645 697,341      
Payment, Tax Withholding, Share-based Payment Arrangement             $ 1,600,000 $ 2,700,000      
Treasury Stock Acquired, Average Cost Per Share             $ 2.30 $ 3.86      
Common Stock, Dividends, Per Share, Declared       $ 0.0025   $ 0.0025 $ 0.0050 $ 0.0050      
Dividends, Common Stock, Total       $ 1,221,000   $ 1,002,000 $ 2,430,000 $ 2,000,000      
Average Realized Silver Price Per Ounce       15.01              
Average Realized Silver Price, Minimum Dividend, Threshold   $ 30   $ 30     $ 30   $ 30    
Stock Issued During Period, Shares, New Issues             0   7,173,614    
Stock Issued During Period, Value, New Issues                 $ 24,500,000    
Payments for Brokerage Fees                 $ 600,000    
Common Stock Repurchase Program [Member]                      
Treasury Stock Acquired, Average Cost Per Share             $ 3.99        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                     20,000,000
Cumulative Stock Repurchased   934,100   934,100     934,100   934,100    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   19,100,000   19,100,000     19,100,000   19,100,000    
Share Price   $ 0   $ 0     $ 0   $ 0    
Subsequent Event [Member]                      
Common Stock, Dividends, Per Share, Declared $ 0.0025                    
Dividends, Common Stock, Total $ 1,000,000.0                    
Minimum [Member]                      
Common Stock, Dividends, Per Share, Declared         $ 0.01            
Maximum [Member]                      
Common Stock, Aggregate Offering Price                   $ 75,000,000  
Performance Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     3,597,380                
Share-based Payment Arrangement, Expense         $ 8,300,000            
Performance Shares [Member] | Executive Officer [Member]                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   30 months                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years                  
Restricted Stock Units (RSUs) [Member]                      
Share-based Payment Arrangement, Expense             $ 5,900,000        
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   2,971,188                  
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   165,764                  
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Three [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   63,589                  
Restricted Stock Units (RSUs) [Member] | Vesting in 2020 [Member]                      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 2,100,000   $ 2,100,000     $ 2,100,000   $ 2,100,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             12 months        
Restricted Stock Units (RSUs) [Member] | Vesting in 2021 [Member]                      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   2,000,000.0   2,000,000.0     $ 2,000,000.0   2,000,000.0    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             24 months        
Restricted Stock Units (RSUs) [Member] | Vesting in 2022 [Member]                      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 1,800,000   $ 1,800,000     $ 1,800,000   $ 1,800,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             36 months        
Restricted Stock Units and Performance Shares [Member]                      
Share-based Payment Arrangement, Expense             $ 3,600,000 $ 2,400,000