Note 10 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands	12 Months Ended
	Dec. 31, 2024 oz lb $ / £ $ / oz	Dec. 31, 2023 lb oz $ / £ $ / oz
Silver 2024 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz		735
Underlying, Derivative Mass | $ / oz		24.4
Gold 2024 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz		3
Underlying, Derivative Mass | $ / oz		2,045
Zinc 2024 Settlements for Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb		441
Underlying, Derivative Mass | $ / £		1.51
Silver 2025 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz	1,535
Underlying, Derivative Mass | $ / oz	31.46
Gold 2025 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz	2
Underlying, Derivative Mass | $ / oz	2,673
Zinc 2025 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	20,834
Underlying, Derivative Mass | $ / £	1.4
Lead 2025 Settlements For Provisional Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	14,661
Underlying, Derivative Mass | $ / £	0.97
Lead 2024 Settlements for Provisional Sales[Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb		15,542
Underlying, Derivative Mass | $ / £		1
Lead 2024 Settlements for Forecasted Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb		56,713
Underlying, Derivative Mass | $ / £		0.98
Zinc 2025 Settlements For Forecasted Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	59,194
Underlying, Derivative Mass | $ / £	1.39
Lead 2025 Settlements For Forecasted Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	47,840	49,273
Underlying, Derivative Mass | $ / £	0.99	0.98
Zinc 2026 Settlements For Forecasted Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	6,283
Underlying, Derivative Mass | $ / £	1.41
Lead 2026 Settlements For Forecasted Sales [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	52,911
Underlying, Derivative Mass | $ / £	1.03