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Summary of Significant Accounting Policies - Assets and liabilities of consolidated VIEs (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets      
Cash $ 939,415 $ 371,497  
Inventories 4,255,117 4,591,902  
Total current assets 9,552,686 9,275,117  
Property and equipment, net 666,590 613,958  
Intangible assets, net 1,103,048 1,062,766  
Goodwill 96,000 0 $ 0
Security deposit, long-term 64,943 15,687  
Total assets 16,755,481 16,797,812  
Liabilities      
Accounts payable/ Intercompany payable 2,944,507 1,882,357  
Total liabilities 18,673,958 18,087,459  
Variable Interest Entity | Levo Mobility LLC      
Assets      
Cash 2,937 10,404  
Inventories 183,219 0  
Intercompany loan receivable 0 930,019  
Prepaid expenses and other current assets 117,279 52,190  
Total current assets 303,435 992,613  
Property and equipment, net 79,000 0  
Intangible assets, net 149,000 0  
Goodwill 96,000 0  
Intercompany receivable 2,482,005 0  
Security deposit, long-term 18,489 0  
Total assets 3,127,929 992,613  
Liabilities      
Accrued expenses and dividend payable 33,594 0  
Promissory notes 1,754,391 884,676  
Total liabilities 3,344,874 1,051,357  
Variable Interest Entity | Levo Mobility LLC | Nonrelated Party      
Liabilities      
Accounts payable/ Intercompany payable 37,397 166,681  
Variable Interest Entity | Levo Mobility LLC | Related Party      
Liabilities      
Accounts payable/ Intercompany payable $ 1,519,492 $ 0