Note 13 - Commitments and Contingencies (Details Textual) | Aug. 24, 2021USD ($)oz | Dec. 30, 2020USD ($) | Dec. 11, 2020shares | Jun. 10, 2020USD ($) | Jul. 15, 2012USD ($) | Sep. 30, 2021USD ($) | Dec. 31, 2020USD ($)shares | Jul. 31, 2008USD ($) | Sep. 30, 2021USD ($) | Feb. 06, 2020USD ($) | Feb. 28, 2019USD ($) |
Contingent Salary and Compensation, Retention Agreement | | | | | | | | | | | $ 1,500,000 |
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) | 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 | |
Production Threshold, One [Member] | Alaska Gold Torrent, LLC [Member] | | | | | | | | | | | |
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Mineral Resource (Ounce) | oz | 500,000 | | | | | | | | | | |
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Output, Gold (Ounce) | oz | 30,000 | | | | | | | | | | |
Gold to Silver Ratio | | | | | | 1:65 | | | | | |
Asset Acquisition, Consideration Transferred, Contingent Consideration | $ 5,000,000 | | | | | | | | | | |
Production Threshold, One [Member] | Alaska Gold Torrent, LLC [Member] | Common Stock [Member] | | | | | | | | | | | |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable | $ 3,750,000 | | | | | | | | | | |
Production Threshold, Two [Member] | Alaska Gold Torrent, LLC [Member] | | | | | | | | | | | |
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Mineral Resource (Ounce) | oz | 1,000,000 | | | | | | | | | | |
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Output, Gold (Ounce) | oz | 60,000 | | | | | | | | | | |
Gold to Silver Ratio | | | | | | 1:65 | | | | | |
Asset Acquisition, Consideration Transferred, Contingent Consideration | $ 5,000,000 | | | | | | | | | | |
Production Threshold, Two [Member] | Alaska Gold Torrent, LLC [Member] | Common Stock [Member] | | | | | | | | | | | |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable | 5,000,000 | | | | | | | | | | |
Tetlin Lease [Member] | | | | | | | | | | | |
Inception-to-date Payments to Reduce Royalty Rate | | | | | | $ 225,000 | | | $ 225,000 | | |
Decrease in Royalty Rates | | | | | | 0.75% | | | 0.75% | | |
Tetlin Lease [Member] | Scenario 1 [Member] | | | | | | | | | | | |
Increase in Royalty Rates | | | | | | 0.25% | | | 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% | | | 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% | | | 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] | | | | | | | | | | | |
Contractual Annual Exploration Costs | | | | | | | | $ 350,000 | | | |
Tetlin Lease [Member] | The Joint Venture Company [Member] | Minimum [Member] | | | | | | | | | | | |
Royalty Rate | | | | | | 2.25% | | 3.00% | 2.25% | | |
Tetlin Lease [Member] | The Joint Venture Company [Member] | Maximum [Member] | | | | | | | | | | | |
Royalty Rate | | | | | | 4.25% | | 5.00% | 4.25% | | |
Tetlin Lease and Certain Other Properties [Member] | | | | | | | | | | | |
Annual Claim Rentals | | | | | | $ 478,650 | | | $ 478,650 | | |
Tetlin Lease and Certain Other Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] | | | | | | | | | | | |
Overriding Royalty Interest | | | | | | 3.00% | | | 3.00% | | |
Lucky Shot Prospect [Member] | Alaska Gold Torrent, LLC [Member] | | | | | | | | | | | |
Asset Acquisition, Exploration Expenditures, Requirement, Minimum Amount During 36 Months Period | $ 10,000,000 | | | | | | | | | | |
Additional Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] | | | | | | | | | | | |
Overriding Royalty Interest | | | | | | 2.00% | | | 2.00% | | |
Net Smelter Returns Silver Royalty, Percent | | | | | | 28.00% | | | 28.00% | | |
Net Smelter Returns Royalty Interest, Percent | | | | | | 1.00% | | | 1.00% | | |