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Note 12 - Related Party Transactions (Details Textual) - USD ($) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 18, 2021 | Sep. 30, 2020 | Sep. 29, 2020 | Sep. 23, 2020 | Nov. 20, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Apr. 16, 2018
Proceeds from Issuance of Common Stock, Net |  |  |  |  |  | $ 14,111,410 |  |  |
Contango Minerals [Member] | Contango Minerals Royalty Agreement [Member] |  |  |  |  |  |  |  |  |
Overriding Royalty Interest |  |  | 2.00% |  |  |  |  |  |
Contango Minerals [Member] | Contango Minerals Royalty Agreement [Member] | ALASKA |  |  |  |  |  |  |  |  |
Overriding Royalty Interest |  |  | 3.00% |  |  |  |  |  |
Net Smelter Returns Royalty Interest, Percent |  |  | 1.00% |  |  |  |  |  |
Contango Minerals [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |
Net Smelter Returns Royalty Interest, Percent |  |  | 1.00% |  |  |  |  |  |
The Joint Venture Company [Member] | Separation Agreement [Member] |  |  |  |  |  |  |  |  |
Net Smelter Returns Silver Royalty, Percent |  |  | 28.00% |  |  |  |  |  |
Royal Gold [Member] |  |  |  |  |  |  |  |  |
Percentage of Issued and Outstanding Shares of Common Stock |  | 0.00% | 11.90% |  |  |  |  |  |
The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 30.00% | 30.00% |  |  | 30.00% |  | 30.00% |
The Joint Venture Company [Member] | KG Mining [Member] |  |  |  |  |  |  |  |  |
Sale of Equity Method Investment, Prepayment of Reimbursement |  | $ 1,200,000 |  |  |  |  |  |  |
The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  |  |  |  |  |
Royal Alaska LLC [Member] | KG Mining [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership, Shares (in shares) |  | 809,744 |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 523,809 |  |  | 247,172 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 21 |  |  | $ 13.25 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 11,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ 10,900,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) |  |  |  | 32,874 |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  | $ 3,300,000 |  |  |  |  |
Proceeds from Issuance of Private Placement, Net of Issuance Costs |  |  |  | 3,200,000 |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | $ 50,000 |  |  |  |  |
Private Placement [Member] | Petrie Partners Securities, LLC [Member] |  |  |  |  |  |  |  |  |
Private Placement Fee, Percentage |  |  |  | 3.25% |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | $ 50,000 |  |  |  |  |
JEX [Member] |  |  |  |  |  |  |  |  |
Management Services Agreement, Fee Per Month |  |  |  |  | $ 10,000 |  |  |  |
JEX [Member] | Expense for Office Space and Equipment [Member] |  |  |  |  |  |  |  |  |
Management Services Agreement, Fee Per Month |  |  |  |  | $ 6,900 |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  | $ 305,000 | $ 504,000 |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 75,472 |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 1,000,000 |  |  |  |  |
Percentage of Ownership Interest Acquired by Related Party |  |  |  | 2.20% |  |  |  |  |
Chief Executive Officer [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 47,619 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 1,000,000 |  |  |  |  |  |  |  |
Kinross [Member] | The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage by Other Owner |  | 70.00% |  |  |  |  |  |  |
Royal Gold [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 26
Percentage of Ownership Interest Acquired by Related Party |  |  |  |  |  |  |  |  | 13.60%

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