Quarterly report [Sections 13 or 15(d)]

Fair Value Measurements - Change in Level 2 Assets (Details)

v3.25.3
Fair Value Measurements - Change in Level 2 Assets (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings $ (74,995) $ 0    
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 18,749 93,744 $ 93,744 $ 93,744
Fair Value, Measurements, Recurring | Eurosite Power, Inc. | Estimate of Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, ending 18,749 93,744    
Fair Value, Measurements, Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 18,749 93,744    
Fair Value, Measurements, Recurring | Level 2 | Eurosite Power, Inc.        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, ending 18,749 93,744    
Fair Value, Measurements, Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring | Level 1 | Eurosite Power, Inc.        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, ending 0 0    
Fair Value, Measurements, Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring | Level 3 | Eurosite Power, Inc.        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value, ending $ 0 $ 0