Note 3 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 20, 2018
Deferred Tax Liabilities, Net, Total	$ 144,900		$ 144,900
Income Tax Expense (Benefit), Total	(11,179)	$ 427	(18,395)	$ 1,195
Klondex Mines Ltd [Member]
Deferred Tax Liabilities, Net, Total					$ 59,500
Income Tax Expense (Benefit), Total			7,900
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Deferred Tax Liabilities, Net, Total	45,400		45,400
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Deferred Tax Liabilities, Net, Total	102,900		102,900
Foreign Tax Authority [Member] | Mexican Tax Authority [Member]
Deferred Tax Liabilities, Net, Total	$ 3,400		$ 3,400