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Note 1 - The Company (Additional Information) (Details) - Alexco Asset Acquisition [Member] $ / shares in Units, $ in Millions | Sep. 07, 2022 USD ($) $ / shares shares
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Asset Acquisition [Line Items] |
Noncash or part noncash acquisition, Interest acquired | 90.10%
Noncash or part noncash acquisition, Noncash financial or equity instrument consideration, Shares issued | shares | 17,992,875
Asset acquisition, Consideration transferred, Equity interest issued and issuable | $ 68.7
Asset acquisition, Consideration transferred | $ 81.5
Asset acquisition, Step acquisition, Investment held in acquiree prior to acquisition, Percentage | 9.90%
Marketable Securities | $ 7.7
Asset Acquisition, Consideration Transferred, Transaction Cost | 5.1
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Deferred tax liabilities | 12.9
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Net liabilities | 7.2
Advance paid to related party | 25.0
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Silver stream liability | $ 135.0
Stock issued during period shares to settle the acquired silver stream | $ / shares | $ 34,800,990
Mineral Interests [Member] |
Asset Acquisition [Line Items] |
Asset acquisition, Recognized identifiable assets acquired and liabilities assumed, Mineral interests | $ 236.6
Common Stock [Member] |
Asset Acquisition [Line Items] |
Asset Acquisition Consideration Transferred Total Non Cash Consideration | $ 76.4

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