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Note 15 - Related Party Transactions (Details Textual) - USD ($)	Jan. 01, 2022	Jun. 18, 2021	Sep. 30, 2020	Sep. 23, 2020	Nov. 20, 2019	Jun. 30, 2022	Sep. 29, 2020
Restricted Stock [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	160,000
Stock Repurchased During Period, Shares (in shares)	60,100
Share Price (in dollars per share)	$ 25.60
Payments for Repurchase of Common Stock	$ 1.5
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%
The Joint Venture Company [Member]
Equity Method Investment, Ownership Percentage			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
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)		$ 21.00		$ 13.25
Proceeds from Issuance of Common Stock		$ 11,000,000.0
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				$ 50,000.00
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
Chief Executive Officer [Member]
Stock Issued During Period, Shares, New Issues (in shares)				75,472
Stock Issued During Period, Value, New Issues				$ 1,000,000.0
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%

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The equity interest of other holders in equity method investment.

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- Definition

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Per share or per unit amount of equity securities issued.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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