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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 147,259 $ 134,279 $ 286,968 $ 276,823
Cost of sales (80,440) (77,503) (153,309) (156,179)
Depreciation, depletion, amortization (31,817) (25,569) (59,871) (54,521)
General and administrative (9,787) (10,309) (17,522) (19,515)
Exploration and pre-development     (17,618)  
Research and development (2,337) (312) (3,773) (995)
Gain (loss) on derivative contracts 16,804 2,487 20,811 (5,322)
Acquisition costs (1,010) 2 (3,517) (25)
Foreign exchange gain (loss) 2,476 (3,883) 5,068 (6,145)
Lucky Friday suspension-related costs (6,801) (8,024) (11,818) (9,605)
Equity in earnings of subsidiaries
Other expense (12,593) (12,182) (23,910) (22,028)
Income (loss) before income taxes 12,501 (7,921) 21,509 (10,158)
(Provision) benefit from income taxes (427) (16,095) (1,195) 12,976
Net income (loss) 12,074 (24,016) 20,314 2,818
Preferred stock dividends (138) (138) (276) (276)
Income (loss) applicable to common stockholders 11,936 (24,154) 20,038 2,542
Changes in comprehensive income (loss) (5,162) 2,878 (7,266) 6,082
Comprehensive income (loss) 6,912 (21,138) 13,048 8,900
Revenues 147,259 134,279 286,968 276,823
Mineral, Exploration [Member]        
Exploration and pre-development (9,253) (6,905)   (12,671)
Reportable Legal Entities [Member] | Parent Company [Member]        
Revenues 2,697 807 3,312 (3,286)
Cost of sales (73) (186) 402 (334)
Depreciation, depletion, amortization
General and administrative (4,615) (5,721) (8,448) (12,190)
Exploration and pre-development     (127)  
Research and development
Gain (loss) on derivative contracts 16,804 2,487 20,811 (5,322)
Acquisition costs (940)   (3,300)  
Foreign exchange gain (loss) (5,731) 7,666 (14,435) 10,133
Lucky Friday suspension-related costs
Equity in earnings of subsidiaries 5,745 (2,355) 23,513 346
Other expense (1,741) (29,115) (1,414) 13,781
Income (loss) before income taxes 12,074 (26,483) 20,314 2,818
(Provision) benefit from income taxes
Net income (loss) 12,074 (26,483) 20,314 2,818
Preferred stock dividends (138) (138) (276) (276)
Income (loss) applicable to common stockholders 11,936 (26,621) 20,038 2,542
Changes in comprehensive income (loss) (5,162) 2,878 (7,266) 6,082
Comprehensive income (loss) 6,912 (23,605) 13,048 8,900
Revenues 2,697 807 3,312 (3,286)
Reportable Legal Entities [Member] | Parent Company [Member] | Mineral, Exploration [Member]        
Exploration and pre-development (72) (66)   (310)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]        
Revenues 75,197 70,344 145,408 153,297
Cost of sales (37,489) (40,816) (72,190) (83,588)
Depreciation, depletion, amortization (11,996) (13,502) (23,256) (29,268)
General and administrative (4,602) (4,094) (8,050) (6,413)
Exploration and pre-development     (5,003)  
Research and development (1,579) (312) (2,061) (995)
Gain (loss) on derivative contracts
Acquisition costs (68)   (68)  
Foreign exchange gain (loss) (74) 1 (74) (43)
Lucky Friday suspension-related costs (6,801) (8,024) (11,818) (9,605)
Equity in earnings of subsidiaries
Other expense (1,616) (1,557) (3,393) (2,409)
Income (loss) before income taxes 7,908 (456) 19,495 16,579
(Provision) benefit from income taxes (3,715) 1,068 (9,203) (7,901)
Net income (loss) 4,193 612 10,292 8,678
Preferred stock dividends
Income (loss) applicable to common stockholders 4,193 612 10,292 8,678
Changes in comprehensive income (loss)
Comprehensive income (loss) 4,193 612 10,292 8,678
Revenues 75,197 70,344 145,408 153,297
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] | Mineral, Exploration [Member]        
Exploration and pre-development (3,064) (2,496)   (4,397)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]        
Revenues 69,365 63,128 138,248 126,812
Cost of sales (42,878) (36,501) (81,521) (72,257)
Depreciation, depletion, amortization (19,821) (12,067) (36,615) (25,253)
General and administrative (570) (494) (1,024) (912)
Exploration and pre-development     (12,488)  
Research and development (758) (1,712)
Gain (loss) on derivative contracts
Acquisition costs (2)   (149)  
Foreign exchange gain (loss) 8,281 (11,550) 19,577 (16,235)
Lucky Friday suspension-related costs
Equity in earnings of subsidiaries
Other expense (5,522) (2,400) (9,901) (9,470)
Income (loss) before income taxes 1,978 (4,227) 14,415 (5,279)
(Provision) benefit from income taxes (426) 3,727 (1,194) (3,053)
Net income (loss) 1,552 (500) 13,221 (8,332)
Preferred stock dividends
Income (loss) applicable to common stockholders 1,552 (500) 13,221 (8,332)
Changes in comprehensive income (loss) 847 38 758
Comprehensive income (loss) 1,552 347 13,259 (7,574)
Revenues 69,365 63,128 138,248 126,812
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] | Mineral, Exploration [Member]        
Exploration and pre-development (6,117) (4,343)   (7,964)
Consolidation, Eliminations [Member]        
Revenues
Cost of sales
Depreciation, depletion, amortization
General and administrative
Exploration and pre-development      
Research and development
Gain (loss) on derivative contracts
Acquisition costs    
Foreign exchange gain (loss)
Lucky Friday suspension-related costs
Equity in earnings of subsidiaries (5,745) 2,355 (23,513) (346)
Other expense (3,714) 20,890 (9,202) (23,930)
Income (loss) before income taxes (9,459) 23,245 (32,715) (24,276)
(Provision) benefit from income taxes 3,714 (20,890) 9,202 23,930
Net income (loss) (5,745) 2,355 (23,513) (346)
Preferred stock dividends
Income (loss) applicable to common stockholders (5,745) 2,355 (23,513) (346)
Changes in comprehensive income (loss) (847) (38) (758)
Comprehensive income (loss) (5,745) 1,508 (23,551) (1,104)
Revenues
Consolidation, Eliminations [Member] | Mineral, Exploration [Member]        
Exploration and pre-development