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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of cash flows (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities      
Net income/(loss) $ (27,541,124) $ 12,598,098 $ 10,658,183
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:      
Net cash provided by operating activities (1,344,032) (6,313,115) (1,019,964)
Cash and restricted cash at beginning of year 2,970,199 1,510,484 1,710,926
Cash and restricted cash at end of the year 565,817 2,970,199 1,510,484
Parent | Reportable legal entity      
Cash flows from operating activities      
Net income/(loss) (27,278,005) 12,453,369 10,545,978
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:      
Equity income/loss in subsidiaries $ 27,278,005 $ (12,453,369) $ (10,545,978)