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Note 9 - Shareholders' Equity (Details Textual)
 10 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
$ / oz
shares
Dec. 31, 2016
USD ($)
$ / shares
$ / oz
shares
Dec. 31, 2015
USD ($)
$ / shares
$ / item
shares
Dec. 31, 2014
USD ($)
$ / item
shares
Feb. 20, 2017
$ / shares
Feb. 23, 2016
USD ($)
May 08, 2012
shares
Jun. 30, 2010
shares
Common Stock, Shares Authorized 500,000,000 500,000,000 500,000,000          
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.25 $ 0.25 $ 0.25          
Common Stock, Shares, Issued 395,286,875 395,286,875 378,112,840          
Average Realized Silver Price Minimum Dividend Threshold 30 30 30 30        
Stock Issued During Period, Shares, New Issues 2,780,087              
Stock Issued During Period, Value, New Issues | $ $ 8,100,000 $ 8,121,000            
Payments for Brokerage Fees | $ $ 166,000              
Class of Warrant or Right, Outstanding     2,249,550          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right     0.1622          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 6.17          
Preferred Stock, Shares Authorized 5,000,000 5,000,000 5,000,000          
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.25 $ 0.25 $ 0.25          
Preferred Stock, Shares Outstanding 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            
Preferred Stock, Liquidation Preference, Value | $ 7,891,000 7,891,000 $ 7,891,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 3,200,000 $ 3,200,000            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,735,564 2,735,564 3,375,798          
Stock Repurchased During Period, Value | $     $ 940,000 $ 1,501,000        
Satisfy Withholding Obligations [Member]                
Treasury Stock Acquired, Average Cost Per Share | $ / shares   $ 3.44 $ 3.05          
Stock Repurchased During Period, Shares   1,010,509 613,698          
Stock Repurchased During Period, Value | $   $ 3,500,000 $ 1,900,000          
2010 Stock Incentive Plan [Member]                
Allocated Share-based Compensation Expense | $   $ 532,000 $ 456,000 $ 366,000        
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 8,302,326 8,302,326            
2010 Stock Incentive Plan [Member] | Non-Employee Directors [Member]                
Stock Issued During Period, Shares, Share-based Compensation, Gross   120,911 186,888 110,910        
Directors Stock Plan [Member]                
Allocated Share-based Compensation Expense | $   $ 271,000 $ 150,000 $ 109,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000 1,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 438,459 438,459            
Share-Based Compensation Arrangement by Share-Based Payment Award, Method of Measuring Cost of Award Participant, Numerator | $   $ 24,000            
Stock Issued During Period, Shares, Share-based Compensation, Gross   68,462 48,244 39,468        
Stock Compensation Plan [Member]                
Allocated Share-based Compensation Expense | $   $ 6,200,000 $ 5,400,000 $ 5,000,000        
Restricted Stock Units (RSUs) [Member]                
Allocated Share-based Compensation Expense | $   3,600,000            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 4,500,000 4,500,000            
Restricted Stock Units (RSUs) [Member] | Expense Recognized Over Remaining Vesting Period [Member]                
Allocated Share-based Compensation Expense | $   $ 4,800,000            
Series B Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares   $ 3.50            
Preferred Stock, Redemption Price Per Share | $ / shares $ 50 50            
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 50 $ 50            
Preferred Stock, Liquidation Preference, Value | $ $ 7,900,000 $ 7,900,000            
Preferred Stock, Voting Rights   1            
Preferred Stock Conversion Price | $ / shares $ 15.55 $ 15.55            
Preferred Stock Conversion Rate | $ / shares $ 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            
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            
Common Stock Repurchase Program [Member] | Subsequent Event [Member]                
Share Price | $ / shares         $ 6.58      
Minimum [Member]                
Common Stock, Dividends, Per Share, Declared | $ / shares   $ 0.01            
Maximum [Member]                
Common Stock, Aggregate Offering Price | $           $ 75,000,000