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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net income (loss) $ (5,411,380) $ 15,595,659
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 4,222,053 4,257,197
Allowance for expected credit losses 17,476 (880,001)
Amortization of operating lease 487,289 591,060
Write-down of inventories 2,579,738 1,993,561
Share-based compensation 49,889 208,766
Share of (profit) loss on equity investee (33,655) 18,736
(Gain) loss on disposal of property, plant and equipment 28,993 (184,179)
Gain on disposal on equity investee (45,648)
Changes in operating assets and liabilities:    
Trade and bills receivable (1,170,925) (3,891,321)
Inventories (17,416,424) (994,717)
Prepayments and other receivable 10,861,222 3,080,423
Trade and bills payable 11,168,111 (8,927,650)
Accrued expenses and other payables and product warranty provisions (495,303) (713,437)
Operating lease liabilities (749,289) (585,850)
Trade receivable from and payables to former subsidiaries 9,569 61,075
Income tax payable 805,375
Net cash provided by operating activities 4,147,364 10,389,049
Cash flows from investing activities    
Deposit paid for acquisition of long-term investment (9,074,133)
Proceeds from disposal of an equity method investees 277,496
Proceeds from disposal of property, plant and equipment 184,179
Purchases of property, plant and equipment and construction in progress (22,319,029) (8,339,568)
Government subsidy 2,794,760
Acquisition of land use right (1,089,802)
Net cash used in investing activities (20,614,071) (16,952,026)
Cash flows from financing activities    
Borrowings from banks 30,737,732 34,537,483
Repayment of bank borrowings (18,710,789) (31,256,920)
Placement of term deposits (39,029,478) (34,629,189)
Withdrawal of term deposits 3,665,548
Repurchase of common stock (1,237,120)
Proceeds from finance lease 1,109,986
Principal payments of finance leases (1,332,538)
Net cash used in financing activities (24,574,107) (31,571,178)
Effect of exchange rate changes on cash and cash equivalents and restricted cash 1,707,034 (561,094)
Net decrease in cash and cash equivalents and restricted cash (39,333,780) (38,695,249)
Cash and cash equivalents and restricted cash at the beginning of period 60,786,002 58,822,816
Cash and cash equivalents and restricted cash at the end of period 21,452,222 20,127,567
Supplemental non-cash investing and financing activities:    
Transfer of construction in progress to property, plant and equipment 884,638 1,698,578
Lease liabilities arising from obtaining right-of-use assets 495,444 2,337,268
Cash paid during the year for:    
Income taxes 1,044,190
Interest, net of amounts capitalized $ 341,376 $ 213,014