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Note 2 - Revision of Previously Issued Financial Statements for Immaterial Misstatements (Tables) | 12 Months Ended
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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 |

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