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Note 15 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (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
Revenues | $ 143,649 | $ 140,839 |  |  |  | $ 430,617 | $ 417,662 |  |
Cost of sales | (93,609) | (68,358) |  |  |  | (246,918) | (224,537) |  |
Depreciation, depletion, amortization | (43,464) | (29,518) | $ (27,033) | $ (30,435) | $ (57,468) | (103,335) | (86,986) | $ (120,599) | $ (123,631)
General and administrative | (10,327) | (9,529) |  |  |  | (27,849) | (29,044) |  |
Exploration and pre-development |  |  |  |  |  | (31,224) |  |  |
Research and development | (1,269) | (1,130) |  |  |  | (5,042) | (2,125) |  |
Loss on derivative contracts | 19,460 | (11,226) |  |  |  | 40,271 | (16,548) |  |
Foreign exchange gain (loss) | (2,212) | (4,917) | (3,080) | (2,260) | (5,340) | 2,856 | (10,258) | (9,680) | (2,737)
Lucky Friday suspension-related costs | (6,519) | (4,780) |  |  |  | (18,337) | (14,385) |  |
Acquisition costs | (6,139) |  |  |  |  | (9,656) | (25) |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |
Other (expense) income | (11,827) | (7,185) |  |  |  | (35,737) | (29,213) |  |
Income (loss) before income taxes | (25,863) | (4,816) | (8,582) | (3,718) | (12,300) | (4,354) | (17,117) | (7,557) | 89,659
Income tax benefit (provision) | 2,679 | 5,130 | (16,366) | 28,800 | 12,434 | 1,484 | 17,564 | (20,963) | (28,090)
Net income (loss) | (23,184) | 314 | (24,948) | 25,082 | 134 | (2,870) | 447 | (28,520) | 61,569
Preferred stock dividends | (138) | (138) |  |  |  | (414) | (414) |  |
Income (loss) applicable to common shareholders | (23,322) | 176 | (25,086) | 24,944 | (142) | (3,284) | 33 | (29,072) | 61,017
Changes in comprehensive income (loss) | 3,746 | 7,636 |  |  |  | (3,520) | 13,718 |  |
Comprehensive income (loss) | (19,438) | 7,950 | $ (22,070) | $ 28,286 | $ 6,216 | (6,390) | 14,165 | $ (17,291) | $ 59,598
Revenues | 143,649 | 140,839 |  |  |  | 430,617 | 417,662 |  |
Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |
Exploration and pre-development | (13,606) | (9,012) |  |  |  |  | (21,683) |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |
Revenues | 5,020 | (626) |  |  |  | 8,332 | (3,912) |  |
Cost of sales | (157) | 687 |  |  |  | 245 | 353 |  |
Depreciation, depletion, amortization |  |  |  |  |  |  |  |  |
General and administrative | (4,802) | (4,217) |  |  |  | (13,250) | (16,407) |  |
Exploration and pre-development |  |  |  |  |  | (128) |  |  |
Research and development |  |  |  |  |  |  |  |  |
Loss on derivative contracts | 19,460 | (11,226) |  |  |  | 40,271 | (16,548) |  |
Foreign exchange gain (loss) | 4,640 | 12,153 |  |  |  | (9,795) | 22,286 |  |
Lucky Friday suspension-related costs |  |  |  |  |  |  |  |  |
Acquisition costs | (5,741) |  |  |  |  | (9,041) |  |  |
Equity in earnings of subsidiaries | (54,618) | (7,369) |  |  |  | (31,105) | (9,708) |  |
Other (expense) income | 13,016 | 11,041 |  |  |  | 11,602 | 24,822 |  |
Income (loss) before income taxes | (23,183) | 314 |  |  |  | (2,869) | 447 |  |
Income tax benefit (provision) | (1) |  |  |  |  | (1) |  |  |
Net income (loss) | (23,184) | 314 |  |  |  | (2,870) | 447 |  |
Preferred stock dividends | (138) | (138) |  |  |  | (414) | (414) |  |
Income (loss) applicable to common shareholders | (23,322) | 176 |  |  |  | (3,284) | 33 |  |
Changes in comprehensive income (loss) | 3,746 | 7,636 |  |  |  | (3,520) | 13,718 |  |
Comprehensive income (loss) | (19,438) | 7,950 |  |  |  | (6,390) | 14,165 |  |
Revenues | 5,020 | (626) |  |  |  | 8,332 | (3,912) |  |
Reportable Legal Entities [Member] | Parent Company [Member] | Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |
Exploration and pre-development | (1) | (129) |  |  |  |  | (439) |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Revenues | 60,155 | 61,887 |  |  |  | 205,563 | 215,184 |  |
Cost of sales | (39,733) | (29,320) |  |  |  | (111,923) | (112,908) |  |
Depreciation, depletion, amortization | (12,427) | (12,607) |  |  |  | (35,683) | (41,875) |  |
General and administrative | (4,866) | (4,464) |  |  |  | (12,916) | (10,877) |  |
Exploration and pre-development |  |  |  |  |  | (9,059) |  |  |
Research and development | (444) | (1,130) |  |  |  | (2,505) | (2,125) |  |
Loss on derivative contracts |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) | 74 |  |  |  |  |  | (43) |  |
Lucky Friday suspension-related costs | (5,388) | (4,780) |  |  |  | (17,206) | (14,385) |  |
Acquisition costs | (245) |  |  |  |  | (313) |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |
Other (expense) income | 881 | 1,202 |  |  |  | (2,512) | (1,207) |  |
Income (loss) before income taxes | (6,049) | 6,449 |  |  |  | 13,446 | 23,028 |  |
Income tax benefit (provision) | (18,552) | (1,338) |  |  |  | (27,755) | (9,239) |  |
Net income (loss) | (24,601) | 5,111 |  |  |  | (14,309) | 13,789 |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |
Income (loss) applicable to common shareholders | (24,601) | 5,111 |  |  |  | (14,309) | 13,789 |  |
Changes in comprehensive income (loss) |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (24,601) | 5,111 |  |  |  | (14,309) | 13,789 |  |
Revenues | 60,155 | 61,887 |  |  |  | 205,563 | 215,184 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |
Exploration and pre-development | (4,056) | (4,339) |  |  |  |  | (8,736) |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Revenues | 78,474 | 79,578 |  |  |  | 216,722 | 206,390 |  |
Cost of sales | (53,719) | (39,725) |  |  |  | (135,240) | (111,982) |  |
Depreciation, depletion, amortization | (31,037) | (16,911) |  |  |  | (67,652) | (45,111) |  |
General and administrative | (659) | (848) |  |  |  | (1,683) | (1,760) |  |
Exploration and pre-development |  |  |  |  |  | (22,037) |  |  |
Research and development | (825) |  |  |  |  | (2,537) |  |  |
Loss on derivative contracts |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) | (6,926) | (17,070) |  |  |  | 12,651 | (32,501) |  |
Lucky Friday suspension-related costs | (1,131) |  |  |  |  | (1,131) |  |  |
Acquisition costs | (153) |  |  |  |  | (302) |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |
Other (expense) income | (5,900) | (4,676) |  |  |  | (15,801) | (14,146) |  |
Income (loss) before income taxes | (31,425) | (4,196) |  |  |  | (17,010) | (11,618) |  |
Income tax benefit (provision) | 1,408 | (8,284) |  |  |  | 214 | (11,879) |  |
Net income (loss) | (30,017) | (12,480) |  |  |  | (16,796) | (23,497) |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |
Income (loss) applicable to common shareholders | (30,017) | (12,480) |  |  |  | (16,796) | (23,497) |  |
Changes in comprehensive income (loss) | 3 | 1,022 |  |  |  | 41 | 1,780 |  |
Comprehensive income (loss) | (30,014) | (11,458) |  |  |  | (16,755) | (21,717) |  |
Revenues | 78,474 | 79,578 |  |  |  | 216,722 | 206,390 |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |
Exploration and pre-development | (9,549) | (4,544) |  |  |  |  | (12,508) |  |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |
Depreciation, depletion, amortization |  |  |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |
Exploration and pre-development |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  |
Loss on derivative contracts |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  |  |  |
Lucky Friday suspension-related costs |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries | 54,618 | 7,369 |  |  |  | 31,105 | 9,708 |  |
Other (expense) income | (19,824) | (14,752) |  |  |  | (29,026) | (38,682) |  |
Income (loss) before income taxes | 34,794 | (7,383) |  |  |  | 2,079 | (28,974) |  |
Income tax benefit (provision) | 19,824 | 14,752 |  |  |  | 29,026 | 38,682 |  |
Net income (loss) | 54,618 | 7,369 |  |  |  | 31,105 | 9,708 |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |
Income (loss) applicable to common shareholders | 54,618 | 7,369 |  |  |  | 31,105 | 9,708 |  |
Changes in comprehensive income (loss) | (3) | (1,022) |  |  |  | (41) | (1,780) |  |
Comprehensive income (loss) | 54,615 | 6,347 |  |  |  | 31,064 | 7,928 |  |
Revenues |  |  |  |  |  |  |  |  |
Consolidation, Eliminations [Member] | Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |
Exploration and pre-development |  |  |  |  |  |  |  |  |

X
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