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Changes of deferred income tax assets and liability (Details) - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Allowance for doubtful trade receivables deferred tax $ 6,652,118 $ 1,995,243
Allowance for doubtful other receivables deferred tax 9,049 6,460
Inventory obsolescence reserve 1,040,107 1,501,687
Expenses not deductible in current year 31,000 31,143
Deferred revenue 377,457  
PRC net operating loss carry forward 1,676,852 328,643
U.S. net operating loss carry forward 1,181,679 1,052,784
Total deferred income tax assets 10,968,262 4,915,960
Valuation allowance (10,968,262) $ (4,915,960)
Net deferred income tax asset $ 0