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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jan. 08, 2015
Income Tax Expense (Benefit), Total			$ 0	$ 0
Liability for Uncertainty in Income Taxes, Current			$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		28.06%
The Joint Venture Company [Member]
Equity Method Investment, Ownership Percentage			60.00%	70.50%	100.00%
The Joint Venture Company [Member] | Peak Gold, LLC [Member]
Equity Method Investment, Ownership Percentage			0.00%	0.00%
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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