v3.26.1
Debt - Narrative (Details)
3 Months Ended
Jan. 09, 2026
USD ($)
Jul. 30, 2025
USD ($)
Aug. 30, 2024
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Oct. 23, 2025
USD ($)
Aug. 14, 2025
USD ($)
Jul. 27, 2022
USD ($)
Debt Instrument [Line Items]                  
Repayment of short-term financings       $ 0 $ 10,000,000        
Total long-term debt and finance leases       103,441,000   $ 96,617,000      
Cash and cash equivalents       45,089,000 $ 50,021,000 41,250,000      
Accrued unpaid interest       200,000   300,000      
MTL Manufacturing & Equipment, Inc.                  
Debt Instrument [Line Items]                  
Purchase price $ 11,100,000                
Revolving Credit Agreement                  
Debt Instrument [Line Items]                  
Long-term debt       95,000,000   95,000,000      
Previous Shareholder Loan Agreements, Weichai | Subordinated Debt                  
Debt Instrument [Line Items]                  
Payment for debt extinguishment or debt prepayment cost     $ 60,000,000.0            
Short-term financing     $ 25,000,000.0            
Promissory Note | Subordinated Debt                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as percent)     4.05%            
Debt instrument, face amount     $ 105,000,000.0            
Debt instrument, incremental borrowing cost (as percent)     1.00%            
Debt instrument, amount not subject to subordination     $ 10,000,000.0            
Promissory Note                  
Debt Instrument [Line Items]                  
Long-term debt       1,125,000          
Promissory Note | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate 8.00%                
Long-term debt       1,125,000   0      
Promissory Note | Secured Debt | MTL Manufacturing & Equipment, Inc.                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,100,000                
First Master Loan Agreement                  
Debt Instrument [Line Items]                  
Long-term debt       3,191,000          
First Master Loan Agreement | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               $ 3,500,000  
Debt instrument, interest rate               6.25%  
Long-term debt       3,191,000   0      
Second Master Loan Agreement                  
Debt Instrument [Line Items]                  
Long-term debt       1,904,000          
Second Master Loan Agreement | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount             $ 2,000,000.0    
Debt instrument, interest rate             6.20%    
Long-term debt       1,904,000   0      
SBA Loan                  
Debt Instrument [Line Items]                  
Long-term debt       619,000          
SBA Loan | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 $ 900,000
Debt instrument, interest rate                 5.03%
Long-term debt       619,000   0      
Prepayment percentage threshold                 20.00%
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 135,000,000.0              
Basis spread on variable rate (as percent)   2.10%              
Debt issuance costs   $ 1,200,000              
Revolving line of credit, long-term       95,000,000.0          
Long-term debt       $ 95,000,000   $ 95,000,000      
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 120,000,000.0            
Basis spread on variable rate (as percent)     2.00%            
Debt issuance costs     $ 600,000            
Proceeds from short-term financings     100,000,000.0            
Majority shareholder ownership threshold for variable rate increase (as percent)   0.50              
Revolving Credit Facility | Revolving Credit Agreement - In Event Majority Shareholder Holds Less Than 50% Of Equity | Line of Credit                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as percent)   2.60%              
Revolving Credit Facility | Fourth Amended And Restated Credit Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Repayment of short-term financings     $ 40,000,000.0