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Segments information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from External Customer [Line Items]      
Total revenues $ 29,765,205 $ 34,209,919 $ 28,849,362
Total cost of revenues 18,518,728 22,825,033 18,596,207
Total gross profit 11,246,477 11,384,886 10,253,155
Selling expense 108,637 106,147 164,583
Depreciation expense 148,280 165,683 207,980
Salary expense 255,049 991,037 1,158,607
Rent 124,753 214,701 292,215
Professional fee 1,296,218 679,438 1,049,378
Other general and administrative expense 340,157 623,660 442,332
Research and development expense 61,786 80,948 112,668
Stock-based compensation 454,250
Provision for (recovery from) credit loss, net 6,459,240 (88,221) 471,454
Other income (expense), net 129,782 183,559 (41,814)
Income before income taxes 1,868,325 8,427,934 6,395,752
Income taxes expenses 462,043 1,403,880 1,152,963
Net income 1,406,282 7,024,054 5,242,789
Sewage Treatment Systems [Member]      
Revenue from External Customer [Line Items]      
Total revenues 28,417,150 32,267,593 26,552,481
Total cost of revenues 17,779,226 21,630,216 17,170,669
Sewage Treatment Services And Others [Member]      
Revenue from External Customer [Line Items]      
Total revenues 1,348,055 1,942,326 2,296,881
Total cost of revenues $ 739,502 $ 1,194,817 $ 1,425,538