Note 8 - Derivative Instruments - Summarize the Quantities of Metals Committed (Details)	Sep. 30, 2025 USD ($) Ounces
2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	25,000
2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	1,300,000
2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	690,000
Maximum [Member] | 2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	$ 45,500
Maximum [Member] | 2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	53,820
Maximum [Member] | 2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	40,080.00
Minimum [Member] | 2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	39,000
Minimum [Member] | 2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	33,130
Minimum [Member] | 2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	$ 30,000