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Note 9 - Debt, Credit Facility and Leases (Details Textual) $ in Thousands, $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2026 | Jul. 21, 2022 USD ($) | Jul. 09, 2020 CAD ($) | Mar. 19, 2020 USD ($) | Feb. 15, 2026 | Feb. 15, 2025 | Feb. 15, 2024 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 09, 2020 USD ($) Contract | Jul. 09, 2020 CAD ($) Contract | Feb. 19, 2020 USD ($)
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  | $ 239,000 | $ 25,000 | $ 0 |  |  |
Finance lease liability |  |  |  |  |  |  |  | 26,815 | 20,900 |  |  |  |
Finance lease liability, current |  |  |  |  |  |  |  | 9,800 | 9,500 |  |  |  |
Finance lease liability, noncurrent |  |  |  |  |  |  |  | 17,000 | 11,400 |  |  |  |
Finance lease right-of-use asset |  |  |  |  |  |  |  | 20,300 | 23,100 |  |  |  |
Finance lease right-of-use asset, amortization |  |  |  |  |  |  |  | 12,600 | 7,100 | 8,900 |  |  |
Finance lease, interest expense |  |  |  |  |  |  |  | 900 | $ 900 | $ 600 |  |  |
Finance lease, liability, payment, due |  |  |  |  |  |  |  | 29,792 |  |  |  |  |
Finance lease, liability, undiscounted excess amount |  |  |  |  |  |  |  | $ 2,977 |  |  |  |  |
Finance lease, weighted average remaining lease term (year) |  |  |  |  |  |  |  | 2 years 2 months 12 days | 1 year 10 months 24 days |  |  |  |
Finance lease, weighted average discount rate, percent |  |  |  |  |  |  |  | 9.90% | 6.50% |  |  |  |
Finance lease, liability, statement of financial position [Extensible Enumeration] |  |  |  |  |  |  |  | Liabilities | Finance lease liability | Finance lease liability |  |  |
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration] |  |  |  |  |  |  |  | Properties, plants, equipment and mineral interests, net | Properties, plants, equipment and mineral interests, net |  |  |  |
Operating lease liability |  |  |  |  |  |  |  | $ 8,634 | $ 11,100 |  |  |  |
Operating lease liability, current |  |  |  |  |  |  |  | 800 | 2,500 |  |  |  |
Operating lease liability, noncurrent |  |  |  |  |  |  |  | 7,800 | 8,600 |  |  |  |
Operating lease right-of-use asset |  |  |  |  |  |  |  | 8,349 | 11,064 |  |  |  |
Operating lease expense |  |  |  |  |  |  |  | $ 3,100 | $ 3,100 | $ 3,900 |  |  |
Operating lease, weighted average remaining lease term (year) |  |  |  |  |  |  |  | 9 years 9 months 18 days | 8 years 10 months 24 days |  |  |  |
Operating lease, weighted average discount rate, percent |  |  |  |  |  |  |  | 6.50% | 6.00% |  |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  | Liabilities, Current |  |  |  |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  | Liabilities, Current | Liabilities, Current |  |  |  |
Operating lease, liability, statement of financial position [Extensible Enumeration] |  |  |  |  |  |  |  | Operating lease liability | Operating lease liability | Operating lease liability |  |  |
New Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 15,100 |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  | 6,900 | $ 7,800 |  |  |  |
Proceeds from lines of credit |  |  |  |  |  |  |  | 128,000 |  |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense debt |  |  |  |  |  |  |  | $ 600 |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, option |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee percentage |  | 0.45% |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, commitment fee percentage |  | 0.7875% |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
New Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 3.50% |  |  |  |  |
New Credit Agreement [Member] | Base Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Debt instrument, basis spread on variable rate, applicable margin |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement [Member] | Base Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
New Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
New Credit Agreement [Member] | Leverage Ratio Applicable Margin [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, participation fee, percent |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement [Member] | Leverage Ratio Applicable Margin [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, participation fee, percent |  | 3.50% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | The 2028 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 7.25% | 7.25% |  |  |  | 7.25%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 475,000
Underwriting discount on senior notes |  |  |  |  |  |  |  |  |  |  |  |  | 1.16%
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500
Debt instrument, redemption price, percentage |  |  |  |  |  | 103.625% | 105.438% |  |  |  |  |  |
Debt instrument, redemption price, percentage, net of cash proceeds of equity offerings |  |  |  |  |  |  |  |  |  | 35.00% |  |  |
Debt instrument, redemption price, percentage, including accrued and unpaid interest |  |  |  |  |  |  |  |  |  | 101.00% |  |  |
Senior Notes [Member] | The 2028 Senior Notes [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |  | 101.813% |  |  |  |  |  |  |  |
Senior Notes [Member] | The 2021 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 469,500 |  |  |  |  |  |  |  |  |
Previously outstanding |  |  |  | 6.875% |  |  |  |  |  |  |  |  |
Interest expense debt |  |  |  |  |  |  |  | $ 34,400 | $ 35,400 | $ 35,400 |  |  |
Senior Notes [Member] | IQ Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 7.25% | 7.25% |  | 6.515% | 6.515% |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 36,800 | $ 50.0 |
Interest expense debt |  |  |  |  |  |  |  | $ 2,300 | $ 2,300 | $ 2,300 |  |  |
Debt instrument, unamortized premium, percentage of principal |  |  |  |  |  |  |  |  |  |  | 103.65% | 103.65% |
Debt instrument, unamortized premium |  |  |  |  |  |  |  |  |  |  |  | $ 1.8 |
Debt instrument, effective annual yield |  |  |  |  |  |  |  |  |  |  | 5.74% | 5.74% |
Debt instrument, number of issuance installments | Contract |  |  |  |  |  |  |  |  |  |  | 4 | 4 |
Proceeds from issuance of debt |  |  | $ 12.5 |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  | $ 0.6 |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, investment over next four years |  |  |  |  |  |  |  |  |  |  |  | $ 100.0 |

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- Definition Indicates line item in statement of financial position that includes finance lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69E Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69F -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69F Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-6 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes current operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-2 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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