Note 8 - Derivative Instruments - Summarize the Quantities of Metals Committed (Details)	Jun. 30, 2025 USD ($) Ounces
2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	100,000
2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	1,515,000
2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Held, Total | Ounces	150,000
Maximum [Member] | 2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	$ 35,430
Maximum [Member] | 2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	41,150
Maximum [Member] | 2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	49,420
Minimum [Member] | 2025 Settlements For Provisional Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	33,500
Minimum [Member] | 2025 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	30,070.00
Minimum [Member] | 2026 Settlements For forecasted Sales [Member]
Derivatives, Fair Value [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	$ 32,000