Note 1 - Basis of Preparation of Financial Statements (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 25, 2026
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Recognized loss	$ 2.4
Hecla Quebec Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of consideration receivable	$ 5.2	$ 601.7

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.