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Income Taxes (Details 1) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful trade receivables | $ 4,537,623 | $ 4,393,775
Allowance for doubtful other receivables | 6,822 | 5,682
Inventory obsolescence reserve | 568,182 | 1,528,482
Expenses not deductible in current year | 1,160,601 | 1,085,520
Advances for intangible assets impairment | 10,441,373 | 9,765,906
Lease liability, net | 596 | 807
PRC net operating loss carry forward | 9,542,576 | 12,682,671
U.S. net operating loss carry forward | 1,409,380 | 1,296,813
Total deferred income tax assets | 27,667,153 | 30,759,656
Valuation allowance | (27,666,557) | (30,738,262)
Net deferred income tax asset |  |
Deferred income tax liability: |  |
Intangible assets | $ 805,556 | $ 753,444

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