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Note 8 - 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 ($) | Feb. 15, 2026 | Feb. 15, 2025 | Feb. 15, 2024 | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 09, 2020 USD ($) Contract | Jul. 09, 2020 CAD ($) Contract | Feb. 19, 2020 USD ($) | Jul. 31, 2018 USD ($)
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  | $ 25,000 | $ 0 | $ 716,327 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |
Net finance lease obligation |  |  |  |  |  |  |  | 20,859 | 13,400 |  |  |  |  |
Finance leases |  |  |  |  |  |  |  | 9,483 | 5,612 |  |  |  |  |
Finance Lease, Liability, Noncurrent |  |  |  |  |  |  |  | 11,400 | $ 7,800 |  |  |  |  |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total |  |  |  |  |  |  |  | $ 23,100 |  |  |  |  |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net |  |  |  |  |
Finance Lease, Right-of-Use Asset, Amortization |  |  |  |  |  |  |  | $ 7,100 | $ 8,900 | 7,400 |  |  |  |
Finance Lease, Interest Expense |  |  |  |  |  |  |  | 900 | 600 | 600 |  |  |  |
Finance Lease, Liability, Payment, Due, Total |  |  |  |  |  |  |  | 22,220 |  |  |  |  |  |
Finance Lease, Liability, Undiscounted Excess Amount |  |  |  |  |  |  |  | $ 1,361 |  |  |  |  |  |
Finance Lease, Weighted Average Remaining Lease Term (Year) |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |
Finance Lease, Weighted Average Discount Rate, Percent |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |
Operating Lease, Liability |  |  |  |  |  |  |  | $ 11,068 | $ 12,400 |  |  |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  | Operating Lease, Liability | Operating Lease, Liability |  |  |  |  |
Operating Lease |  |  |  |  |  |  |  | $ 2,500 | $ 2,500 |  |  |  |  |
Operating Lease, Liability, Noncurrent |  |  |  |  |  |  |  | 8,600 | 10,000 |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  | 11,064 | 12,435 |  |  |  |  |
Operating Lease, Expense |  |  |  |  |  |  |  | 3,100 | 3,900 | 7,200 |  |  |  |
Finance Lease, Liability |  |  |  |  |  |  |  | $ 20,859 | $ 13,400 |  |  |  |  |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  | Finance Lease, Liability | Finance Lease, Liability |  |  |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  |  |  | $ 14,579 |  |  |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term (Year) |  |  |  |  |  |  |  | 8 years 10 months 24 days |  |  |  |  |  |
Properties, Plants, Equipment and Mineral Interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total |  |  |  |  |  |  |  |  | $ 18,300 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000
Long-term Line of Credit |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit Outstanding, Fronting Fee |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20%
Letter of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit, Participation Fee, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25%
Letter of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit, Participation Fee, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00%
New Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 142,200 |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  | 7,800 |  |  |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |
Prior Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt balance |  |  |  |  |  |  |  | $ 506,366 | $ 508,095 |  |  |  |  |
Senior Notes [Member] | The 2028 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 7.25% |  |  |  |  | 7.25% |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 475,000 |
Underwriting Discount on Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | 1.16% |
Debt Instrument, Unamortized Discount, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500 |
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% |  |  |  |  |
Long-term debt balance |  |  |  |  |  |  |  | $ 470,360 | $ 469,448 |  |  |  |  |
Senior Notes [Member] | The 2028 Senior Notes [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  | 101.813% | 103.625% | 105.438% |  |  |  |  |  |  |
Senior Notes [Member] | The 2021 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  | $ 469,500 |  |  |  |  |  |  |  |  |  |
Previously Outstanding |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  |  |  | 35,400 | 35,400 | 40,200 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net, Total |  |  |  |  |  |  |  |  | 1,700 |  |  |  |  |
Senior Notes [Member] | IQ Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 6.515% | 6.515% |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 36,800 | $ 50.0 |  |
Interest Expense, Debt, Total |  |  |  |  |  |  |  | 2,300 | 2,300 | $ 900 |  |  |  |
Debt Instrument, Unamortized Premium, Percentage of Principal |  |  |  |  |  |  |  |  |  |  | 103.65% | 103.65% |  |
Debt Instrument, Unamortized Premium, Total |  |  |  |  |  |  |  |  |  |  |  | $ 1.8 |  |
Debt Instrument, Effective Annual Yield |  |  |  |  |  |  |  |  |  |  | 5.74% | 5.74% |  |
Long-term debt balance |  |  |  |  |  |  |  | $ 36,006 | $ 38,647 |  |  | $ 48.2 |  |
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 Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69F -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 + Details
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