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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenues | $ 139,709 | $ 142,544
Cost of sales | (72,869) | (78,676)
Depreciation, depletion, amortization | (28,054) | (28,952)
General and administrative | (7,735) | (9,206)
Exploration and pre-development | (100,923) | (107,628)
Research and development | (1,436) | (683)
Gain (loss) on derivative contracts | 4,007 | (7,809)
Acquisition costs | 2,507 | 27
Equity in earnings of subsidiaries |  |
Other (expense) income | (13,742) | (14,372)
Income (loss) before income taxes | 9,008 | (2,237)
(Provision) benefit from income taxes | (768) | 29,071
Net income (loss) | 8,240 | 26,834
Preferred stock dividends | (138) | (138)
Income (loss) applicable to common stockholders | 8,102 | 26,696
Changes in comprehensive income (loss) | (2,104) | 3,204
Comprehensive income (loss) | 6,136 | 30,038
Mineral, Exploration [Member] |  |
Exploration and pre-development | (8,365) | (5,766)
Reportable Legal Entities [Member] | Parent Company [Member] |  |
Revenues | 615 | (4,093)
Cost of sales | 475 | (148)
Depreciation, depletion, amortization |  |
General and administrative | (3,833) | (6,469)
Research and development |  |
Gain (loss) on derivative contracts | 4,007 | (7,809)
Acquisition costs | (2,360) |
Equity in earnings of subsidiaries | 17,768 | 2,701
Other (expense) income | (8,377) | 42,896
Income (loss) before income taxes | 8,240 | 26,834
(Provision) benefit from income taxes |  |
Net income (loss) | 8,240 | 26,834
Preferred stock dividends | (138) | (138)
Income (loss) applicable to common stockholders | 8,102 | 26,696
Changes in comprehensive income (loss) | (2,104) | 3,204
Comprehensive income (loss) | 6,136 | 30,038
Reportable Legal Entities [Member] | Parent Company [Member] | Mineral, Exploration [Member] |  |
Exploration and pre-development | (55) | (244)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Revenues | 70,211 | 82,953
Cost of sales | (34,701) | (42,772)
Depreciation, depletion, amortization | (11,260) | (15,766)
General and administrative | (3,448) | (2,319)
Research and development | (482) |
Gain (loss) on derivative contracts |  |
Acquisition costs |  |
Equity in earnings of subsidiaries |  |
Other (expense) income | (6,794) | (3,116)
Income (loss) before income taxes | 11,587 | 17,079
(Provision) benefit from income taxes | (5,488) | (8,969)
Net income (loss) | 6,099 | 8,110
Preferred stock dividends |  |
Income (loss) applicable to common stockholders | 6,099 | 8,110
Changes in comprehensive income (loss) |  |
Comprehensive income (loss) | 6,099 | 8,110
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |
Exploration and pre-development | (1,939) | (1,901)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Revenues | 68,883 | 63,684
Cost of sales | (38,643) | (35,756)
Depreciation, depletion, amortization | (16,794) | (13,186)
General and administrative | (454) | (418)
Research and development | (954) |
Gain (loss) on derivative contracts |  |
Acquisition costs | (147) |
Equity in earnings of subsidiaries |  |
Other (expense) income | 6,917 | (9,332)
Income (loss) before income taxes | 12,437 | 1,371
(Provision) benefit from income taxes | (768) | (6,780)
Net income (loss) | 11,669 | (5,409)
Preferred stock dividends |  |
Income (loss) applicable to common stockholders | 11,669 | (5,409)
Changes in comprehensive income (loss) | 38 | (89)
Comprehensive income (loss) | 11,707 | (5,498)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Mineral, Exploration [Member] |  |
Exploration and pre-development | (6,371) | (3,621)
Consolidation, Eliminations [Member] |  |
Revenues |  |
Cost of sales |  |
Depreciation, depletion, amortization |  |
General and administrative |  |
Research and development |  |
Gain (loss) on derivative contracts |  |
Acquisition costs |  |
Equity in earnings of subsidiaries | (17,768) | (2,701)
Other (expense) income | (5,488) | (44,820)
Income (loss) before income taxes | (23,256) | (47,521)
(Provision) benefit from income taxes | 5,488 | 44,820
Net income (loss) | (17,768) | (2,701)
Preferred stock dividends |  |
Income (loss) applicable to common stockholders | (17,768) | (2,701)
Changes in comprehensive income (loss) | (38) | 89
Comprehensive income (loss) | (17,806) | (2,612)
Consolidation, Eliminations [Member] | Mineral, Exploration [Member] |  |
Exploration and pre-development |  |

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