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Changes of deferred income tax assets and liability (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful trade receivables deferred tax $ 664,492 $ 530,461
Allowance for doubtful other receivables deferred tax 7,482 5,838
Inventory obsolescence reserve 265,498  
Expenses not deductible in current year 30,200 29,927
Share based compensation deferred tax 45,777 172,911
U.S. net operating loss carry forwards 905,669 618,236
Total deferred income tax assets 1,919,118 1,357,373
Valuation allowance deferred tax assets (951,447) (791,147)
Net deferred income tax asset. 967,671 566,226
Intangible assets income tax liability $ 95,963 $ 128,909