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Note 12 - Related Party Transactions (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2017 | Sep. 30, 2016 | Jun. 30, 2018 | Apr. 16, 2018 | Jun. 30, 2017 | Sep. 30, 2012 | Nov. 29, 2010
Common Stock, Par or Stated Value Per Share |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Stock Issued During Period, Value, New Issues |  |  | $ 10,519,768 |  |  |  |
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 [Member] |  |  |  |  |  |  |
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 |  |  |
Royal Gold [Member] | Common Stock [Member] | Minimum [Member] |  |  |  |  |  |  |
Percentage of Ownership Interest Acquired by Related Party |  |  |  | 13.20% |  |  |

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