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

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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