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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2020 | Dec. 11, 2020 | Jun. 10, 2020 | Jul. 15, 2012 | Dec. 31, 2020 | Jul. 31, 2008 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 06, 2020 | Feb. 28, 2019
Contingent Salary and Compensation, Retention Agreement |  |  |  |  |  |  |  |  |  | $ 1,500,000
Restricted Stock [Member] | The 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  | 205,833 | 233,000 |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Contingent Salary and Compensation, Retention Agreement |  |  | $ 350,000 |  |  |  |  |  | $ 1,000,000 |
Short Term Incentive Plan, Minimum Performance Target, Payout, Percentage of Base Salary |  |  | 25.00% |  |  |  |  |  |  |
Short Term Incentive Plan, All Performance Goals, Payout, Percentage of Base Salary |  |  | 100.00% |  |  |  |  |  |  |
Short Term Incentive Plan, Maximum Performance Target, Payout, Percentage of Base Salary |  |  | 200.00% |  |  |  |  |  |  |
Short Term Incentive Plan, Payout, Percentage Cash |  |  | 50.00% |  |  |  |  |  |  |
Short Term Incentive Plan, Payout, Percentage Restricted Stock |  |  | 50.00% |  |  |  |  |  |  |
Short Term Incentive Plan, Change of Control, Percentage of Base Salary |  |  | 200.00% |  |  |  |  |  |  |
Short Term Incentive Plan, Change of Control, Maximum Period of Payment (Day) |  |  | 30 days |  |  |  |  |  |  |
Short-term Incentive Plan, Compensation Expense, Cash Bonus |  |  |  |  | $ 350,000 |  |  |  |  |
Chief Executive Officer [Member] | Restricted Stock [Member] | The 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 23,333 |  |  | 23,333 |  |  |  |  |
Chief Executive Officer [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 1 year |  |  |  |  |  |  |
Chief Executive Officer [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 2 years |  |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |
Contingent Salary and Compensation, Retention Agreement |  |  |  |  |  |  |  |  | $ 250,000 |
Tetlin Lease [Member] |  |  |  |  |  |  |  |  |  |
Inception-to-date Payments to Reduce Royalty Rate |  |  |  |  |  |  | $ 225,000 |  |  |
Decrease in Royalty Rates |  |  |  |  |  |  | 0.75% |  |  |
Tetlin Lease [Member] | Scenario 1 [Member] |  |  |  |  |  |  |  |  |  |
Increase in Royalty Rates |  |  |  |  |  |  | 0.25% |  |  |
Payment that Lessor May Pay to Lessee to Increase Royalty Rate |  |  |  |  |  |  | $ 150,000 |  |  |
Tetlin Lease [Member] | Scenario 2 [Member] |  |  |  |  |  |  |  |  |  |
Increase in Royalty Rates |  |  |  |  |  |  | 0.50% |  |  |
Payment that Lessor May Pay to Lessee to Increase Royalty Rate |  |  |  |  |  |  | $ 300,000 |  |  |
Tetlin Lease [Member] | Scenario 3 [Member] |  |  |  |  |  |  |  |  |  |
Increase in Royalty Rates |  |  |  |  |  |  | 0.75% |  |  |
Payment that Lessor May Pay to Lessee to Increase Royalty Rate | $ 450,000 |  |  |  |  |  |  |  |  |
Tetlin Lease [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Advance Royalties to Be Paid Per Year |  |  |  | $ 75,000 |  |  | $ 50,000 |  |  |
Tetlin Lease [Member] | The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |  |
Initial Term of Leases and Concessions on Undeveloped Acreage (Year) |  |  |  |  |  | 10 years |  |  |  |
Extension of Term of Leases and Concessions on Undeveloped Acreage (Year) |  |  |  |  |  | 10 years |  |  |  |
Contractual Annual Exploration Costs |  |  |  |  |  | $ 350,000 |  |  |  |
Tetlin Lease [Member] | The Joint Venture Company [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Royalty Rate |  |  |  |  |  | 3.00% | 2.25% |  |  |
Tetlin Lease [Member] | The Joint Venture Company [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Royalty Rate |  |  |  |  |  | 5.00% | 4.25% |  |  |
Tetlin Lease and Certain Other Properties [Member] |  |  |  |  |  |  |  |  |  |
Annual Claim Rentals |  |  |  |  |  |  | $ 349,955 |  |  |
Tetlin Lease and Certain Other Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |  |  |  |  |  |  |
Overriding Royalty Interest |  |  |  |  |  |  | 3.00% |  |  |
Additional Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |  |  |  |  |  |  |
Overriding Royalty Interest |  |  |  |  |  |  | 2.00% |  |  |
Net Smelter Returns Silver Royalty, Percent |  |  |  |  |  |  | 28.00% |  |  |
Net Smelter Returns Royalty Interest, Percent |  |  |  |  |  |  | 1.00% |  |  |

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