v3.26.1
Income taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Amount    
Income tax expense at Federal statutory tax rate $ (234,882) $ (326,568)
Increase (decrease) in tax rate resulting from: 22,213 (117,287)
Nontaxable or nondeductible items 12,425 7,959
Valuation allowance 143,277 0
Other adjustments 106 (266,433)
Total provision for (benefit of) income taxes $ 24,678 $ (739,530)
Percent    
Income tax expense at Federal statutory tax rate 21.00% 21.00%
State and local income taxes, net of federal benefit (2.00%) 7.50%
Nontaxable or nondeductible items (1.10%) (0.50%)
Valuation allowance (12.80%) 0.00%
Other adjustments 0.00% 17.20%
Income tax expense (2.20%) 47.70%
Hong Kong    
Amount    
State and local income taxes, net of federal benefit(1) $ 58,062 $ 19,622
Percent    
Foreign tax effects (statutory rate differential) (5.20%) (1.30%)
Canada    
Amount    
State and local income taxes, net of federal benefit(1) $ 27,390 $ 3,320
Percent    
Foreign tax effects (statutory rate differential) (2.40%) (0.20%)
Cayman Islands    
Amount    
State and local income taxes, net of federal benefit(1) $ (17,059) $ 55,003
Percent    
Foreign tax effects (statutory rate differential) 1.50% (3.50%)
Cambodia    
Amount    
State and local income taxes, net of federal benefit(1) $ (13,335) $ (72,348)
Percent    
Foreign tax effects (statutory rate differential) 1.20% 4.70%
Other    
Amount    
State and local income taxes, net of federal benefit(1) $ 26,481 $ (42,798)
Percent    
Foreign tax effects (statutory rate differential) (2.40%) 2.80%