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Note 2 - Revision of Previously Issued Financial Statements - Impact of Understatement of DDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Debit - Inventories: concentrates, doré, and stockpiled ore | $ 42,464 |  |  |  |  | $ 42,464 |  | $ 29,366 |
Debit - Accumulated deficit | 223,280 |  |  |  |  | 223,280 |  | 218,089 |
Debit - DDA expense |  |  |  | $ 31,073 | $ 59,855 | 108,814 | $ 91,255 | 126,467 | $ 124,918
Credit - Net foreign exchange gain (loss) | 2,212 | $ 4,917 | $ 3,080 | 2,260 | 5,340 | (2,856) | 10,258 | 9,680 | 2,737
Net Income (Loss) Attributable to Parent, Total | (23,184) | 314 | (24,948) | 25,082 | 134 | (2,870) | 447 | (28,520) | 61,569
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |
Debit - Inventories: concentrates, doré, and stockpiled ore |  |  |  |  |  |  |  | 911 |
Debit - Accumulated deficit |  |  |  |  |  |  |  | 22,605 |
Debit - DDA expense |  |  |  | 1,483 | 2,947 |  | 3,621 | 4,537 | 7,505
Credit - Net foreign exchange gain (loss) |  | 153 | (803) | (2) | (805) |  | (651) | (620) | (189)
Net Income (Loss) Attributable to Parent, Total |  | $ (1,098) | $ (932) | $ (1,752) | $ (2,684) |  | $ (3,783) | $ (5,001) | $ (7,978)
Understatement of Accumulated Depreciation, Depletion and Amortization [Member] | Period from June 01, 2013 Through June 30, 2018 [Member] |  |  |  |  |  |  |  |  |
Debit - DDA expense |  |  |  |  |  | 5,000 |  |  |
Credit - Net foreign exchange gain (loss) |  |  |  |  |  | (200) |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  | (4,800) |  |  |
Understatement of Accumulated Depreciation, Depletion and Amortization [Member] | Period from June 01, 2013 Through June 30, 2018 [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |
Credit - Accumulated DDA (recorded within properties, plants, equipment and mineral interests, net) | (36,200) |  |  |  |  | (36,200) |  |  |
Debit - Inventories: concentrates, doré, and stockpiled ore | 1,100 |  |  |  |  | 1,100 |  |  |
Understatement of Accumulated Depreciation, Depletion and Amortization [Member] | At January 01, 2018 [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |
Debit - Accumulated deficit | $ 30,300 |  |  |  |  | $ 30,300 |  |  |

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