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Changes of deferred income tax assets and liability (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Changes of deferred income tax assets and liability    
Allowance for doubtful trade receivables deferred tax $ 1,995,243 $ 664,492
Allowance for doubtful other receivables deferred tax 6,460 7,482
Inventory obsolescence reserve 1,501,687 265,498
Expenses not deductible in current year 31,143 30,200
Share based compensation deferred tax 0 45,777
PRC Net operating loss carry forward 328,643 0
U.S. net operating loss carry forwards 1,052,784 905,669
Total deferred income tax assets 4,915,960 1,919,118
Valuation allowance, (4,915,960) (951,447)
Net deferred income tax asset. 0 967,671
Intangible assets income tax liability $ 176,414 $ 95,963