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Note 14 - Guarantor Subsidiaries (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
As of June 30, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
163,357
     $
24,387
     $
51,978
     $
—
     $
239,722
  
Other current assets
    
18,609
      
44,279
      
49,822
      
(70
)
    
112,640
  
Properties, plants, and equipment - net
    
1,927
      
1,246,318
      
758,347
      
—
      
2,006,592
  
Intercompany receivable (payable)
    
281,519
      
(145,439
)
    
(332,954
)
    
196,874
      
—
  
Investments in subsidiaries
    
1,379,384
      
—
      
—
      
(1,379,384
)
    
—
  
Other non-current assets
    
23,669
      
8,357
      
8,296
      
(6,682
)
    
33,640
  
Total assets
   $
1,868,465
     $
1,177,902
     $
535,489
     $
(1,189,262
)
   $
2,392,594
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(212,784
)
   $
77,213
     $
39,180
     $
201,724
     $
105,333
  
Long-term debt
    
533,230
      
5,825
      
2,932
      
—
      
541,987
  
Non-current portion of accrued reclamation
    
—
      
66,157
      
11,945
      
—
      
78,102
  
Non-current deferred tax liability
    
—
      
11,916
      
112,148
      
(11,602
)
    
112,462
  
Other non-current liabilities
    
46,720
      
5,584
      
1,107
      
—
      
53,411
  
Stockholders' equity
    
1,501,299
      
1,011,207
      
368,177
      
(1,379,384
)
    
1,501,299
  
Total liabilities and stockholders' equity
   $
1,868,465
     $
1,177,902
     $
535,489
     $
(1,189,262
)
   $
2,392,594
  
   
As of December 31, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and cash equivalents
   $
103,878
     $
31,016
     $
51,213
     $
—
     $
186,107
  
Other current assets
    
47,555
      
47,608
      
39,630
      
(575
)
    
134,218
  
Properties, plants, and equipment - net
    
1,946
      
1,244,161
      
773,914
      
—
      
2,020,021
  
Intercompany receivable (payable)
    
287,310
      
(177,438
)
    
(341,182
)
    
231,310
      
—
  
Investments in subsidiaries
    
1,358,025
      
—
      
—
      
(1,358,025
)
    
—
  
Other non-current assets
    
14,409
      
7,289
      
9,283
      
(6,370
)
    
24,611
  
Total assets
   $
1,813,123
     $
1,152,636
     $
532,858
     $
(1,133,660
)
   $
2,364,957
  
Liabilities and Stockholders' Equity
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Current liabilities
   $
(226,576
)
   $
66,550
     $
37,671
     $
234,485
     $
112,130
  
Long-term debt
    
502,229
      
2,303
      
3,890
      
—
      
508,422
  
Non-current portion of accrued reclamation
    
—
      
67,565
      
11,801
      
—
      
79,366
  
Non-current deferred tax liability
    
—
      
10,120
      
121,546
      
(10,120
)
    
121,546
  
Other non-current liabilities
    
53,588
      
5,185
      
838
      
—
      
59,611
  
Stockholders' equity
    
1,483,882
      
1,000,913
      
357,112
      
(1,358,025
)
    
1,483,882
  
Total liabilities and stockholders' equity
   $
1,813,123
     $
1,152,636
     $
532,858
     $
(1,133,660
)
   $
2,364,957
  
Condensed Income Statement [Table Text Block]
   
Three Months Ended June 30, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
2,697
     $
75,197
     $
69,365
     $
—
     $
147,259
  
Cost of sales
    
(73
)
    
(37,489
)
    
(42,878
)
    
—
      
(80,440
)
Depreciation, depletion, amortization
    
—
      
(11,996
)
    
(19,821
)
    
—
      
(31,817
)
General and administrative
    
(4,615
)
    
(4,602
)
    
(570
)
    
—
      
(9,787
)
Exploration and pre-development
    
(72
)
    
(3,064
)
    
(6,117
)
    
—
      
(9,253
)
Research and development
    
—
      
(1,579
)
    
(758
)
    
—
      
(2,337
)
Gain on derivative contracts
    
16,804
      
—
      
—
      
—
      
16,804
  
Acquisition costs
    
(940
)
    
(68
)
    
(2
)
    
—
      
(1,010
)
Foreign exchange gain (loss)
    
(5,731
)
    
(74
)
    
8,281
      
—
      
2,476
  
Lucky Friday suspension-related costs
    
—
      
(6,801
)
    
—
      
—
      
(6,801
)
Equity in earnings of subsidiaries
    
5,745
      
—
      
—
      
(5,745
)
    
—
  
Other expense
    
(1,741
)
    
(1,616
)
    
(5,522
)
    
(3,714
)
    
(12,593
)
Income (loss) before income taxes
    
12,074
      
7,908
      
1,978
      
(9,459
)
    
12,501
  
(Provision) benefit from income taxes
    
—
      
(3,715
)
    
(426
)
    
3,714
      
(427
)
Net income (loss)
    
12,074
      
4,193
      
1,552
      
(5,745
)
    
12,074
  
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common stockholders
    
11,936
      
4,193
      
1,552
      
(5,745
)
    
11,936
  
Net income (loss)
    
12,074
      
4,193
      
1,552
      
(5,745
)
    
12,074
  
Changes in comprehensive income (loss)
    
(5,162
)
    
—
      
—
      
—
      
(5,162
)
Comprehensive income (loss)
   $
6,912
     $
4,193
     $
1,552
     $
(5,745
)
   $
6,912
  
   
Six Months Ended June 30, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
3,312
     $
145,408
     $
138,248
     $
—
     $
286,968
  
Cost of sales
    
402
      
(72,190
)
    
(81,521
)
    
—
      
(153,309
)
Depreciation, depletion, amortization
    
—
      
(23,256
)
    
(36,615
)
    
—
      
(59,871
)
General and administrative
    
(8,448
)
    
(8,050
)
    
(1,024
)
    
—
      
(17,522
)
Exploration and pre-development
    
(127
)
    
(5,003
)
    
(12,488
)
    
—
      
(17,618
)
Research and development
    
—
      
(2,061
)
    
(1,712
)
    
—
      
(3,773
)
Loss on derivative contracts
    
20,811
      
—
      
—
      
—
      
20,811
  
Acquisition costs
    
(3,300
)
    
(68
)
    
(149
)
    
—
      
(3,517
)
Foreign exchange gain (loss)
    
(14,435
)
    
(74
)
    
19,577
      
—
      
5,068
  
Lucky Friday suspension-related costs
    
—
      
(11,818
)
    
—
      
—
      
(11,818
)
Equity in earnings of subsidiaries
    
23,513
      
—
      
—
      
(23,513
)
    
—
  
Other expense
    
(1,414
)
    
(3,393
)
    
(9,901
)
    
(9,202
)
    
(23,910
)
Income (loss) before income taxes
    
20,314
      
19,495
      
14,415
      
(32,715
)
    
21,509
  
(Provision) benefit from income taxes
    
—
      
(9,203
)
    
(1,194
)
    
9,202
      
(1,195
)
Net income (loss)
    
20,314
      
10,292
      
13,221
      
(23,513
)
    
20,314
  
Preferred stock dividends
    
(276
)
    
—
      
—
      
—
      
(276
)
Income (loss) applicable to common stockholders
    
20,038
      
10,292
      
13,221
      
(23,513
)
    
20,038
  
Net income (loss)
    
20,314
      
10,292
      
13,221
      
(23,513
)
    
20,314
  
Changes in comprehensive income (loss)
    
(7,266
)
    
—
      
38
      
(38
)
    
(7,266
)
Comprehensive income (loss)
   $
13,048
     $
10,292
     $
13,259
     $
(23,551
)
   $
13,048
  
   
Three Months Ended June 30, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
807
     $
70,344
     $
63,128
     $
—
     $
134,279
  
Cost of sales
    
(186
)
    
(40,816
)
    
(36,501
)
    
—
      
(77,503
)
Depreciation, depletion, amortization
    
—
      
(13,502
)
    
(12,067
)
    
—
      
(25,569
)
General and administrative
    
(5,721
)
    
(4,094
)
    
(494
)
    
—
      
(10,309
)
Exploration and pre-development
    
(66
)
    
(2,496
)
    
(4,343
)
    
—
      
(6,905
)
Research and development
    
—
      
(312
)
    
—
      
—
      
(312
)
Gain on derivative contracts
    
2,487
      
—
      
—
      
—
      
2,487
  
Foreign exchange gain (loss)
    
7,666
      
1
      
(11,550
)
    
—
      
(3,883
)
Lucky Friday suspension costs
    
—
      
(8,024
)
    
—
      
—
      
(8,024
)
Equity in earnings of subsidiaries
    
(2,355
)
    
—
      
—
      
2,355
      
—
  
Other (expense) income
    
(29,115
)
    
(1,557
)
    
(2,400
)
    
20,890
      
(12,182
)
Income (loss) before income taxes
    
(26,483
)
    
(456
)
    
(4,227
)
    
23,245
      
(7,921
)
(Provision) benefit from income taxes
    
—
      
1,068
      
3,727
      
(20,890
)
    
(16,095
)
Net income (loss)
    
(26,483
)
    
612
      
(500
)
    
2,355
      
(24,016
)
Preferred stock dividends
    
(138
)
    
—
      
—
      
—
      
(138
)
Income (loss) applicable to common stockholders
    
(26,621
)
    
612
      
(500
)
    
2,355
      
(24,154
)
Net income (loss)
    
(26,483
)
    
612
      
(500
)
    
2,355
      
(24,016
)
Changes in comprehensive income (loss)
    
2,878
      
—
      
847
      
(847
)
    
2,878
  
Comprehensive income (loss)
   $
(23,605
)
   $
612
     $
347
     $
1,508
     $
(21,138
)
   
Six Months Ended June 30, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Revenues
   $
(3,286
)
   $
153,297
     $
126,812
     $
—
     $
276,823
  
Cost of sales
    
(334
)
    
(83,588
)
    
(72,257
)
    
—
      
(156,179
)
Depreciation, depletion, amortization
    
—
      
(29,268
)
    
(25,253
)
    
—
      
(54,521
)
General and administrative
    
(12,190
)
    
(6,413
)
    
(912
)
    
—
      
(19,515
)
Exploration and pre-development
    
(310
)
    
(4,397
)
    
(7,964
)
    
—
      
(12,671
)
Research and development
    
—
      
(995
)
    
—
      
—
      
(995
)
Loss on derivative contracts
    
(5,322
)
    
—
      
—
      
—
      
(5,322
)
Foreign exchange gain (loss)
    
10,133
      
(43
)
    
(16,235
)
    
—
      
(6,145
)
Lucky Friday suspension costs
    
—
      
(9,605
)
    
—
      
—
      
(9,605
)
Equity in earnings of subsidiaries
    
346
      
—
      
—
      
(346
)
    
—
  
Other (expense) income
    
13,781
      
(2,409
)
    
(9,470
)
    
(23,930
)
    
(22,028
)
Income (loss) before income taxes
    
2,818
      
16,579
      
(5,279
)
    
(24,276
)
    
(10,158
)
(Provision) benefit from income taxes
    
—
      
(7,901
)
    
(3,053
)
    
23,930
      
12,976
  
Net income (loss)
    
2,818
      
8,678
      
(8,332
)
    
(346
)
    
2,818
  
Preferred stock dividends
    
(276
)
    
—
      
—
      
—
      
(276
)
Income (loss) applicable to common stockholders
    
2,542
      
8,678
      
(8,332
)
    
(346
)
    
2,542
  
Net income (loss)
    
2,818
      
8,678
      
(8,332
)
    
(346
)
    
2,818
  
Changes in comprehensive income (loss)
    
6,082
      
—
      
758
      
(758
)
    
6,082
  
Comprehensive income (loss)
   $
8,900
     $
8,678
     $
(7,574
)
   $
(1,104
)
   $
8,900
  
Condensed Cash Flow Statement [Table Text Block]
   
Six Months Ended June 30, 2018
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
27,981
     $
60,805
     $
2,166
     $
(43,934
)
   $
47,018
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(25,454
)
    
(17,850
)
    
—
      
(43,304
)
Other investing activities, net
    
6,294
      
44
      
420
      
21,359
      
28,117
  
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(2,276
)
    
—
      
—
      
—
      
(2,276
)
Issuance of debt
    
31,024
      
—
      
—
      
—
      
31,024
  
Payments on debt
    
—
      
(1,393
)
    
(2,369
)
    
—
      
(3,762
)
Other financing activity
    
(3,544
)
    
(40,658
)
    
18,930
      
22,575
      
(2,697
)
Effect of exchange rate changes on cash
    
—
      
—
      
(532
)
    
—
      
(532
)
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
59,479
      
(6,656
)
    
765
      
—
      
53,588
  
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
103,878
      
32,048
      
51,213
      
—
      
187,139
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
163,357
     $
25,392
     $
51,978
     $
—
     $
240,727
  
   
Six Months Ended June 30, 2017
  
   
Parent
    
Guarantors
    
Non-
Guarantors
    
Eliminations
    
Consolidated
  
   
(in thousands)
  
Cash flows from operating activities
   $
9,131
     $
13,792
     $
10,757
     $
12,141
     $
45,821
  
Cash flows from investing activities:
                                        
Additions to properties, plants, and equipment
    
—
      
(19,132
)
    
(26,832
)
    
 
      
(45,964
)
Other investing activities, net
    
(8,500
)
    
164
      
(22
)
    
(424
)
    
(8,782
)
Cash flows from financing activities:
                                        
Dividends paid to stockholders
    
(2,257
)
    
—
      
—
      
 
      
(2,257
)
Payments on debt
    
—
      
(3,044
)
    
(671
)
    
 
      
(3,715
)
Other financing activity
    
(11,169
)
    
9,501
      
20,430
      
(11,717
)
    
7,045
  
Effect of exchange rate changes on cash
    
—
      
—
      
1,086
      
—
      
1,086
  
Changes in cash, cash equivalents and restricted cash and cash equivalents
    
(12,795
)
    
1,281
      
4,748
      
—
      
(6,766
)
Beginning cash, cash equivalents and restricted cash and cash equivalents
    
113,275
      
26,588
      
32,114
      
—
      
171,977
  
Ending cash, cash equivalents and restricted cash and cash equivalents
   $
100,480
     $
27,869
     $
36,862
     $
—
     $
165,211