v3.26.1
Note 9 - Debt, Credit Facility and Leases (Details Textual)
$ in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Feb. 16, 2026
Jul. 21, 2022
Mar. 19, 2020
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Feb. 15, 2026
Dec. 31, 2025
USD ($)
Feb. 15, 2025
Dec. 31, 2024
USD ($)
Feb. 15, 2024
Dec. 31, 2023
USD ($)
Dec. 31, 2021
May 03, 2024
USD ($)
Jul. 09, 2020
USD ($)
Jul. 09, 2020
CAD ($)
Feb. 19, 2020
USD ($)
Proceeds from issuance of long-term debt       $ 0 $ 107,000   $ 153,000   $ 279,000   $ 239,000          
Finance lease liability       4,174     5,486   11,500              
Finance lease liability, current             4,300   5,500              
Finance lease liability, noncurrent             2,400   8,200              
Finance lease right-of-use asset             400   4,400              
Finance lease right-of-use asset, amortization             4,700   6,000   11,600          
Finance lease, interest expense             200   $ 400   300          
Finance lease, liability, payment, due       4,326     5,715                  
Finance lease, liability, undiscounted excess amount       152     $ 229                  
Finance lease, weighted average remaining lease term (year)             1 year 2 months 12 days   1 year 7 months 6 days              
Finance lease, weighted average discount rate, percent             4.50%   6.10%              
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]             Liabilities   Liabilities              
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration]             Properties, plants, equipment and mine development, net   Properties, plants, equipment and mine development, net              
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]             Liabilities, Current   Liabilities, Current              
Operating lease liability       18,883     $ 9,294   $ 8,000              
Operating lease liability, current             1,100   900              
Operating lease liability, noncurrent             8,200   7,100              
Operating lease right-of-use asset       18,435     8,859   7,544              
Operating lease expense             $ 3,800   $ 3,800   3,100          
Operating lease, weighted average remaining lease term (year)             6 years 1 month 6 days   7 years 3 months 18 days              
Operating lease, weighted average discount rate, percent             5.50%   5.70%              
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]             Liabilities, Current   Liabilities, Current              
Minimum [Member]                                
Finance lease, liability, payment, due             $ 5,700                  
Finance lease, liability, undiscounted excess amount             200                  
IQ Notes [Member]                                
Debt instrument total payment             34,700                  
New Credit Agreement [Member]                                
Line of credit facility, maximum borrowing capacity             218,300                  
Long-term line of credit             $ 6,700   $ 6,200              
Proceeds from lines of credit                 23,000              
New Credit Agreement [Member] | Revolving Credit Facility [Member]                                
Line of credit facility, maximum borrowing capacity                         $ 75,000      
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]                                
Line of credit facility, maximum borrowing capacity                         150,000      
Line of credit facility, commitment fee percentage   0.45%                            
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]                                
Line of credit facility, maximum borrowing capacity                         $ 225,000      
Line of credit facility, commitment fee percentage   0.7875%                            
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Minimum [Member]                                
Debt instrument, basis spread on variable rate             2.00%                  
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member]                                
Debt instrument, basis spread on variable rate             3.50%                  
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Base Rate [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] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                                
Debt instrument, basis spread on variable rate             2.50%                  
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]                                
Debt instrument, basis spread on variable rate   0.50%                            
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Leverage Ratio Applicable Margin [Member] | Minimum [Member]                                
Debt instrument, participation fee, percent   2.00%                            
New Credit Agreement [Member] | Revolving Credit Facility [Member] | Leverage Ratio Applicable Margin [Member] | Maximum [Member]                                
Debt instrument, participation fee, percent   3.50%                            
New Credit Agreement [Member] | Letter of Credit [Member]                                
Letters of credit, drawn amount       0                        
Senior Notes [Member]                                
Long-term debt balance                 $ 495,184              
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 total payment             $ 216,000                  
Debt instrument call premium             3,800                  
Interest expense debt             200                  
Loss on Extinguishment             4,900                  
Debt instrument, redemption price, percentage 100.00%         101.813%   103.625%   105.438%            
Debt instrument, redemption price, percentage, net of cash proceeds of equity offerings                       35.00%        
Partially redeemed amount             212,000                  
Debt instrument, redemption price, percentage, including accrued and unpaid interest                       101.00%        
Long-term debt balance       $ 262,073     261,947   $ 472,184              
Payments of debt issuance costs             1,100                  
Senior Notes [Member] | The 2021 Senior Notes [Member]                                
Proceeds from issuance of long-term debt     $ 469,500                          
Previously outstanding     6.875%                          
Interest expense debt             $ 34,600   $ 35,400   34,400          
Senior Notes [Member] | IQ Notes [Member]                                
Debt instrument, interest rate, stated percentage       7.25%     7.25%   7.25%         6.515% 6.515%  
Debt instrument, face amount                           $ 36,800 $ 50.0  
Payment of Interest             $ 1,100                  
Interest expense debt             1,100   $ 2,200   $ 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%  
Long-term debt balance                 $ 0           $ 48.2  
Senior Notes [Member] | New Credit Agreement [Member]                                
Letters of credit, drawn amount       $ 225,000     $ 225