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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues | $ 136,925 | $ 152,617
Cost of sales | (85,887) | (110,386)
Depreciation, depletion, amortization | (39,666) | (38,787)
General and administrative | (8,939) | (9,959)
Exploration and pre-development | (3,065) | (5,258)
Gain on derivative contracts | 7,893 | (1,799)
Acquisition costs | (5) | (13)
Equity in earnings of subsidiaries | 0 | 0
Other (expense) income | (25,503) | (18,761)
(Loss) income before income taxes | (18,247) | (32,749)
Benefit (provision) from income taxes | 1,062 | 7,216
Net (loss) income | (17,185) | (25,533)
Series B Preferred Stock dividends declared | (138) | (138)
(Loss) income applicable to common stockholders | (17,323) | (25,671)
Changes in comprehensive (loss) income | (19,335) | 4,259
Comprehensive (loss) income | (36,520) | (21,274)
Research and development | 0 | (403)
Gain (loss) on derivative contracts | 7,893 | (1,799)
Reportable Legal Entities [Member] | Parent Company [Member] |  |
Revenues | 1,679 | (2,477)
Cost of sales | (284) | (461)
Depreciation, depletion, amortization | 0 | 0
General and administrative | (3,163) | (4,393)
Exploration and pre-development | (12) | (16)
Gain on derivative contracts | 7,893 | (1,799)
Acquisition costs | (5) | 42
Equity in earnings of subsidiaries | 11,330 | (22,432)
Other (expense) income | (34,623) | 6,003
(Loss) income before income taxes | (17,185) | (25,533)
Benefit (provision) from income taxes | 0 | 0
Net (loss) income | (17,185) | (25,533)
Series B Preferred Stock dividends declared | (138) | (138)
(Loss) income applicable to common stockholders | (17,323) | (25,671)
Changes in comprehensive (loss) income | (19,335) | 4,259
Comprehensive (loss) income | (36,520) | (21,274)
Research and development |  | 0
Gain (loss) on derivative contracts | 7,893 | (1,799)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Revenues | 125,316 | 142,494
Cost of sales | (78,751) | (99,333)
Depreciation, depletion, amortization | (38,193) | (37,027)
General and administrative | (5,339) | (5,111)
Exploration and pre-development | (2,055) | (3,062)
Gain on derivative contracts | 0 | 0
Acquisition costs | 0 | (55)
Equity in earnings of subsidiaries | 0 | 0
Other (expense) income | 10,704 | (19,778)
(Loss) income before income taxes | 11,682 | (22,275)
Benefit (provision) from income taxes | 1,056 | (62)
Net (loss) income | 12,738 | (22,337)
Series B Preferred Stock dividends declared | 0 | 0
(Loss) income applicable to common stockholders | 12,738 | (22,337)
Changes in comprehensive (loss) income | 0 | 0
Comprehensive (loss) income | 12,738 | (22,337)
Research and development |  | (403)
Gain (loss) on derivative contracts | 0 | 0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Revenues | 9,930 | 12,600
Cost of sales | (6,852) | (10,592)
Depreciation, depletion, amortization | (1,473) | (1,760)
General and administrative | (437) | (455)
Exploration and pre-development | (998) | (2,180)
Gain on derivative contracts | 0 | 0
Acquisition costs | 0 | 0
Equity in earnings of subsidiaries | 0 | 0
Other (expense) income | (741) | 1,407
(Loss) income before income taxes | (571) | (980)
Benefit (provision) from income taxes | (837) | 885
Net (loss) income | (1,408) | (95)
Series B Preferred Stock dividends declared | 0 | 0
(Loss) income applicable to common stockholders | (1,408) | (95)
Changes in comprehensive (loss) income | 0 | 0
Comprehensive (loss) income | (1,408) | (95)
Research and development |  | 0
Gain (loss) on derivative contracts | 0 | 0
Consolidation, Eliminations [Member] |  |
Revenues | 0 | 0
Cost of sales | 0 | 0
Depreciation, depletion, amortization | 0 | 0
General and administrative | 0 | 0
Exploration and pre-development | 0 | 0
Gain on derivative contracts | 0 | 0
Acquisition costs | 0 | 0
Equity in earnings of subsidiaries | (11,330) | 22,432
Other (expense) income | (843) | (6,393)
(Loss) income before income taxes | (12,173) | 16,039
Benefit (provision) from income taxes | 843 | 6,393
Net (loss) income | (11,330) | 22,432
Series B Preferred Stock dividends declared | 0 | 0
(Loss) income applicable to common stockholders | (11,330) | 22,432
Changes in comprehensive (loss) income | 0 | 0
Comprehensive (loss) income | (11,330) | 22,432
Research and development |  | 0
Gain (loss) on derivative contracts | $ 0 | $ 0

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