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Note 16 - Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net (loss) income |  |  | $ 68,778
(Loss) income applicable to common shareholders |  |  | $ 68,226
Basic and diluted (loss) income per common share (in dollars per share) |  |  | $ 0.17
Klondex Mines Ltd [Member] |  |  |
Sales | $ 680,261 | $ 785,859 | $ 834,789
Net (loss) income | (19,574) | (35,203) | 73,724
(Loss) income applicable to common shareholders | $ (20,126) | $ (35,755) | $ 73,172
Basic and diluted (loss) income per common share (in dollars per share) | $ (0.04) | $ (0.08) | $ 0.16
Revett Mining Company, Inc. [Member] |  |  |
Sales |  |  | $ 645,957

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