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Income taxes (Details 1) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Allowance for doubtful accounts $ 37,403 $ 37,242
Depreciation and amortization
Impairment loss for investment 34,947 34,797
Net operating loss carry forward 496,494 494,364
Inventory reserve 3,854 3,838
Right of use 70,711 2,045
Less: valuation allowance (513,397) (442,832)
Deferred tax assets, net 130,012 129,454
Deferred tax liabilities:    
Recognition of intangible assets arising from business acquisition (262,789) (289,884)
Deferred tax liabilities, net (262,789) (289,884)
Total deferred tax liabilities, net $ (132,777) $ (160,430)