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Note 2 - Revision of Previously Issued Financial Statements for Immaterial Misstatements - Impact of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2016 | Dec. 31, 2015
Inventories: Concentrate, doré, and stockpiled ore |  | $ 53,172 | $ 29,366 |  |  |
Total current assets |  | 164,150 | 321,236 |  |  |
Properties, plants, equipment and mineral interests, net | [1] | 2,520,004 | 1,999,311 |  |  |
Total assets | [2] | 2,703,944 | 2,345,158 | $ 2,355,795 |  |
Deferred tax liability |  | 173,537 | 124,352 |  |  |
Total liabilities |  | 1,012,981 | 883,881 |  |  |
Accumulated deficit |  | (248,308) | (218,089) | (185,041) | $ (242,191) |
Total shareholders' equity |  | 1,690,963 | 1,461,277 | 1,462,240 | 1,329,300 | $ 1,329,300
Total liabilities and shareholders' equity |  | 2,703,944 | 2,345,158 |  |  |
Depreciation, depletion and amortization | [2] | 134,044 | 120,599 | 123,631 |  |
Total cost of sales |  | 488,038 | 425,326 | 461,956 |  |
Gross profit |  | 79,099 | 152,449 | 184,001 |  |
Income (loss) from operations | [2] | (39,126) | 60,106 | 109,439 |  |
Foreign Currency Transaction Gain (Loss), Realized |  | 10,310 | (9,680) | (2,737) |  |
Total other (expense) income |  | 5,862 | (67,663) | (19,780) |  |
Income (Loss) from continuing operations |  | (33,264) | (7,557) | 89,659 |  |
Income tax (provision) benefit |  | 6,701 | (20,963) | (28,090) |  |
Net Income (Loss) Attributable to Parent, Total |  | (26,563) | (28,520) | 61,569 |  |
(Loss) income applicable to common shareholders |  | (27,115) | (29,072) | 61,017 |  |
Comprehensive income (loss) |  | $ (44,370) | $ (17,291) | $ 59,598 |  |
Basic (loss) income per common share after preferred dividends (in dollars per share) |  | $ (0.06) | $ (0.07) | $ 0.16 |  |
Diluted (loss) income per common share after preferred dividends (in dollars per share) |  | $ (0.06) | $ (0.07) | $ 0.16 |  |
Depreciation, depletion and amortization |  | $ 140,905 | $ 126,467 | $ 124,918 |  |
Foreign exchange loss (gain) |  | (7,104) | 10,208 | 4,460 |  |
Deferred income taxes |  | $ (9,699) | 19,392 | 2,774 |  |
Previously Reported [Member] |  |  |  |  |  |
Inventories: Concentrate, doré, and stockpiled ore |  |  | 28,455 |  |  |
Total current assets |  |  | 320,325 |  |  |
Properties, plants, equipment and mineral interests, net |  |  | 2,020,021 |  |  |
Total assets |  |  | 2,364,957 |  |  |
Deferred tax liability |  |  | 121,546 |  |  |
Total liabilities |  |  | 881,075 |  |  |
Accumulated deficit |  |  | (195,484) | (167,437) | (232,565) |
Total shareholders' equity |  |  | 1,483,882 | 1,479,844 | 1,338,926 |
Total liabilities and shareholders' equity |  |  | 2,364,957 |  |  |
Depreciation, depletion and amortization |  |  | 116,062 | 116,126 |  |
Total cost of sales |  |  | 420,789 | 454,451 |  |
Gross profit |  |  | 156,986 | 191,506 |  |
Income (loss) from operations |  |  | 64,643 | 116,944 |  |
Foreign Currency Transaction Gain (Loss), Realized |  |  | (10,300) | (2,926) |  |
Total other (expense) income |  |  | (68,283) | (19,969) |  |
Income (Loss) from continuing operations |  |  | (3,640) | 96,975 |  |
Income tax (provision) benefit |  |  | (19,879) | (27,428) |  |
Net Income (Loss) Attributable to Parent, Total |  |  | (23,519) | 69,547 |  |
(Loss) income applicable to common shareholders |  |  | (24,071) | 68,995 |  |
Comprehensive income (loss) |  |  | $ (12,290) | $ 67,576 |  |
Basic (loss) income per common share after preferred dividends (in dollars per share) |  |  | $ (0.06) | $ 0.18 |  |
Diluted (loss) income per common share after preferred dividends (in dollars per share) |  |  | $ (0.06) | $ 0.18 |  |
Depreciation, depletion and amortization |  |  | $ 121,930 | $ 117,413 |  |
Foreign exchange loss (gain) |  |  | 10,828 | 4,649 |  |
Deferred income taxes |  |  | 18,308 | 2,112 |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Inventories: Concentrate, doré, and stockpiled ore |  |  | 911 |  |  |
Total current assets |  |  | 911 |  |  |
Properties, plants, equipment and mineral interests, net |  |  | (20,710) |  |  |
Total assets |  |  | (19,799) |  |  |
Deferred tax liability |  |  | 2,806 |  |  |
Total liabilities |  |  | 2,806 |  |  |
Accumulated deficit |  |  | (22,605) | (17,604) | (9,626) |
Total shareholders' equity |  |  | (22,605) | (17,604) | $ (9,626) |
Total liabilities and shareholders' equity |  |  | (19,799) |  |  |
Depreciation, depletion and amortization |  |  | 4,537 | 7,505 |  |
Total cost of sales |  |  | 4,537 | 7,505 |  |
Gross profit |  |  | (4,537) | (7,505) |  |
Income (loss) from operations |  |  | (4,537) | (7,505) |  |
Foreign Currency Transaction Gain (Loss), Realized |  |  | 620 | 189 |  |
Total other (expense) income |  |  | 620 | 189 |  |
Income (Loss) from continuing operations |  |  | (3,917) | (7,316) |  |
Income tax (provision) benefit |  |  | (1,084) | (662) |  |
Net Income (Loss) Attributable to Parent, Total |  |  | (5,001) | (7,978) |  |
(Loss) income applicable to common shareholders |  |  | (5,001) | (7,978) |  |
Comprehensive income (loss) |  |  | $ (5,001) | $ (7,978) |  |
Basic (loss) income per common share after preferred dividends (in dollars per share) |  |  | $ (0.01) | $ (0.02) |  |
Diluted (loss) income per common share after preferred dividends (in dollars per share) |  |  | $ (0.01) | $ (0.02) |  |
Depreciation, depletion and amortization |  |  | $ 4,537 | $ 7,505 |  |
Foreign exchange loss (gain) |  |  | (620) | (189) |  |
Deferred income taxes |  |  | $ 1,084 | $ 662 |  |
[1] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.
[2] | Amounts reported as of and for the years ended December 31, 2017 and 2016 have been revised. See Note 2 for more information.

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