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Note 2 - Revision of Previously Issued Financial Statements for Immaterial Misstatements (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
   
As of and for the Year Ended December 31, 2017
  
(in thousands)
  
As Previously
Reported
    
Adjustment
    
As Revised
  
Condensed Consolidated Balance Sheet
  
 
 
 
  
 
 
 
  
 
 
 
Inventories: Concentrate, doré, and stockpiled ore
   $
28,455
     $
911
     $
29,366
  
Total current assets
    
320,325
      
911
      
321,236
  
Properties, plants, equipment and mineral interests, net
    
2,020,021
      
(20,710
)
    
1,999,311
  
Total assets
  
 
2,364,957
    
 
(19,799
)
  
 
2,345,158
  
Deferred tax liability
    
121,546
      
2,806
      
124,352
  
Total liabilities
    
881,075
      
2,806
      
883,881
  
Accumulated deficit
    
(195,484
)
    
(22,605
)
    
(218,089
)
Total shareholders' equity
    
1,483,882
      
(22,605
)
    
1,461,277
  
Total liabilities and shareholders' equity
  
 
2,364,957
    
 
(19,799
)
  
 
2,345,158
  
                         
Consolidated Statements of Operations and Comprehensive (Loss) Income
  
 
 
 
  
 
 
 
  
 
 
 
Depreciation, depletion and amortization
   $
116,062
     $
4,537
     $
120,599
  
Total cost of sales
    
420,789
      
4,537
      
425,326
  
Gross profit
    
156,986
      
(4,537
)
    
152,449
  
Income (loss) from operations
  
 
64,643
    
 
(4,537
)
  
 
60,106
  
Foreign exchange (loss) gain
    
(10,300
)
    
620
      
(9,680
)
Total other (expense) income
    
(68,283
)
    
620
      
(67,663
)
(Loss) income before income taxes
  
 
(3,640
)
  
 
(3,917
)
  
 
(7,557
)
Income tax (provision) benefit
    
(19,879
)
    
(1,084
)
    
(20,963
)
Net (loss) income
   $
(23,519
)
   $
(5,001
)
   $
(28,520
)
(Loss) income applicable to common shareholders
  
$
(24,071
)
  
$
(5,001
)
  
$
(29,072
)
Comprehensive income (loss)
    
(12,290
)
    
(5,001
)
    
(17,291
)
Basic (loss) income per common share after preferred dividends
  
$
(0.06
)
  
$
(0.01
)
  
$
(0.07
)
Diluted (loss) income per common share after preferred dividends
  
$
(0.06
)
  
$
(0.01
)
  
$
(0.07
)
                         
Condensed Consolidated Statements of Cash Flows
  
 
 
 
  
 
 
 
  
 
 
 
Net (loss) income
   $
(23,519
)
   $
(5,001
)
   $
(28,520
)
Depreciation, depletion and amortization
    
121,930
      
4,537
      
126,467
  
Foreign exchange loss (gain)
    
10,828
      
(620
)
    
10,208
  
Deferred income taxes
    
18,308
      
1,084
      
19,392
  
   
As of and for the Year Ended December 31, 2016
  
(in thousands)
  
As Previously
Reported
    
Adjustment
    
As Revised
  
Condensed Consolidated Balance Sheet
  
 
 
 
  
 
 
 
  
 
 
 
Accumulated deficit
   $
(167,437
)
   $
(17,604
)
   $
(185,041
)
Total shareholders' equity
    
1,479,844
      
(17,604
)
    
1,462,240
  
                         
Consolidated Statements of Operations and Comprehensive (Loss) Income
  
 
 
 
  
 
 
 
  
 
 
 
Depreciation, depletion and amortization
    
116,126
      
7,505
      
123,631
  
Total cost of sales
    
454,451
      
7,505
      
461,956
  
Gross profit
    
191,506
      
(7,505
)
    
184,001
  
Income (loss) from operations
  
 
116,944
    
 
(7,505
)
  
 
109,439
  
Foreign exchange (loss) gain
    
(2,926
)
    
189
      
(2,737
)
Total other (expense) income
    
(19,969
)
    
189
      
(19,780
)
(Loss) income before income taxes
  
 
96,975
    
 
(7,316
)
  
 
89,659
  
Income tax (provision) benefit
    
(27,428
)
    
(662
)
    
(28,090
)
Net (loss) income
   $
69,547
     $
(7,978
)
   $
61,569
  
(Loss) income applicable to common shareholders
  
$
68,995
    
$
(7,978
)
  
$
61,017
  
Comprehensive income (loss)
    
67,576
      
(7,978
)
    
59,598
  
Basic (loss) income per common share after preferred dividends
  
$
0.18
    
$
(0.02
)
  
$
0.16
  
Diluted (loss) income per common share after preferred dividends
  
$
0.18
    
$
(0.02
)
  
$
0.16
  
                         
Condensed Consolidated Statements of Cash Flows
  
 
 
 
  
 
 
 
  
 
 
 
Net (loss) income
   $
69,547
     $
(7,978
)
   $
61,569
  
Depreciation, depletion and amortization
    
117,413
      
7,505
      
124,918
  
Foreign exchange loss (gain)
    
4,649
      
(189
)
    
4,460
  
Deferred income taxes
    
2,112
      
662
      
2,774
  
   
As of January 1, 2016
  
(in thousands)
  
As Previously
Reported
    
Adjustment
    
As Revised
  
Consolidated Statements of Changes in Shareholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
Accumulated deficit
   $
(232,565
)
   $
(9,626
)
   $
(242,191
)
Total shareholders' equity
    
1,338,926
      
(9,626
)
    
1,329,300