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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