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Note 9 - Related Party Transactions (Details Textual) - USD ($)		1 Months Ended
	Oct. 23, 2017	Sep. 30, 2016	Mar. 31, 2019	Jun. 30, 2018	Apr. 26, 2018	Apr. 16, 2018	Jan. 22, 2018	Sep. 30, 2012	Nov. 29, 2010
Common Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01	$ 0.01
Long-term Debt, Total			$ 0
The Joint Venture Company [Member]
Equity Method Investment, Ownership Percentage			60.00%		60.00%
Private Placement [Member] | Certain Purchasers [Member]
Stock Issued During Period, Shares, New Issues	553,672
Common Stock, Par or Stated Value Per Share	$ 0.01
Shares Issued, Price Per Share	$ 19
Proceeds from Issuance of Private Placement	$ 10,500,000
Proceeds from Issuance of Private Placement, Net of Issuance Costs	$ 10,000,000
Private Placement Fee, Percentage	6.50%
Private Placement Fee, Reduced Percentage	3.25%
Payments of Stock Issuance Costs	$ 500,000
JEX [Member]
Overriding Royalty Interest			3.00%					2.00%
Management Services Agreement, Initial Term		1 year
Management Services Agreement, Fee Per Month		$ 32,000
JEX [Member] | Expense for Office Space and Equipment [Member]
Management Services Agreement, Fee Per Month		$ 6,900
JEX [Member] | ALASKA
Overriding Royalty Interest								2.00%
Juneau Exploration L.P. [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues	13,200
Stock Issued During Period, Value, New Issues	$ 250,800
Royal Gold [Member]
Overriding Royalty Interest									3.00%
Royal Gold [Member] | Common Stock [Member]
Shares Issued, Price Per Share						$ 26
Percentage of Ownership Interest Acquired by Related Party						13.60%	12.70%

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