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Note 9 - Shareholders' Equity (Details Textual)
12 Months Ended 22 Months Ended 68 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
$ / oz
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2017
USD ($)
$ / shares
$ / oz
shares
Dec. 31, 2017
USD ($)
$ / shares
$ / oz
shares
Feb. 12, 2018
$ / shares
Feb. 23, 2016
USD ($)
May 08, 2012
shares
Jun. 30, 2010
shares
Common Stock, Shares Authorized | shares 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 | shares 403,705,875     403,705,875 403,705,875        
Treasury Stock, Shares | shares 4,529,450 3,941,210   4,529,450 4,529,450        
Common Stock, Shares, Outstanding | shares 399,176,425 395,286,875   399,176,425 399,176,425        
Average Realized Silver Price, Minimum Dividend, Threshold | $ / oz 30     30 30        
Stock Issued During Period, Shares, New Issues | shares 1,828,760     4,608,847          
Stock Issued During Period, Value, New Issues $ 9,611,000 $ 8,121,000   $ 17,700,000          
Payments for Brokerage Fees $ 196,000     $ 362,000          
Preferred Stock, Shares Authorized | shares 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 | shares 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 $ 3,400,000     $ 3,400,000 $ 3,400,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares 2,095,318 2,735,564   2,095,318 2,095,318        
Share-based Compensation Arrangement by Share-based Payment Award, Measurement Period Used to Value Performance-based Awards 3 years                
Stock Repurchased During Period, Value     $ 940,000            
Satisfy Withholding Obligations [Member]                  
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 4.88 $ 3.44              
Stock Repurchased During Period, Shares | shares 588,240 1,010,509              
Stock Repurchased During Period, Value $ 2,900,000 $ 3,500,000              
2010 Stock Incentive Plan [Member]                  
Allocated Share-based Compensation Expense   $ 532,000 $ 456,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares                 20,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 6,866,026     6,866,026 6,866,026        
2010 Stock Incentive Plan [Member] | Non-Employee Directors [Member]                  
Stock Issued During Period, Shares, Share-based Compensation, Gross | shares   120,911 186,888            
Directors Stock Plan [Member]                  
Allocated Share-based Compensation Expense $ 774,000 $ 271,000 $ 150,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 3,282,337     3,282,337 3,282,337        
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator $ 100,000                
Stock Issued During Period, Shares, Share-based Compensation, Gross | shares 156,122 68,462 48,244            
Stock Compensation Plan [Member]                  
Allocated Share-based Compensation Expense $ 6,300,000 $ 6,200,000 $ 5,400,000            
Restricted Stock Units (RSUs) [Member]                  
Allocated Share-based Compensation Expense 3,700,000                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 4,300,000     $ 4,300,000 $ 4,300,000        
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member]                  
Allocated Share-based Compensation Expense 5,100,000                
Performance Shares [Member]                  
Allocated Share-based Compensation Expense 400,000 $ 600,000              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 700,000     $ 700,000 $ 700,000        
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        
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 | shares               20,000,000  
Cumulative Stock Repurchased | shares 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 | shares 19,100,000     19,100,000 19,100,000        
Common Stock Repurchase Program [Member] | Subsequent Event [Member]                  
Share Price | $ / shares           $ 3.75      
Minimum [Member]                  
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.01                
Maximum [Member]                  
Common Stock, Aggregate Offering Price             $ 75,000,000