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Income Taxes (Details 2) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful trade receivables | $ 4,393,775 | $ 4,453,769
Allowance for doubtful other receivables | 5,682 | 8,721
Inventory obsolescence reserve | 1,528,482 | 1,487,087
Expenses not deductible in current year | 1,085,520 | 1,101,268
Advances for intangible assets impairment | 9,765,906 | 5,628,803
Lease liability, net | 807 |
PRC net operating loss carry forward | 12,682,671 | 13,124,191
U.S. net operating loss carry forward | 1,296,813 | 1,187,112
Total deferred income tax assets | 30,759,656 | 26,990,951
Valuation allowance | (30,759,656) | (26,990,951)
Net deferred income tax asset |  |
Deferred income tax liability: |  |
Intangible assets | $ 753,444 | $ 764,374

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