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Note 11 - Income Taxes - Deferred Tax Asset (Details) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Deferred tax asset:
Investment in the Joint Venture Company	$ 5,851,376	$ 8,747,508
State deferred tax assets	3,122,042	2,118,225
Stock option expenses	523,249	125,855
Net operating losses	2,454,203	3,260,495
Valuation allowance	(11,950,870)	(14,252,083)
Net deferred tax assets

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Deferred Tax Assets, Capitalized Exploration

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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