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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Net operating loss carried forward $ 28,502,024 $ 26,595,654
Valuation allowance (31,954,197) (30,523,274)
Deferred tax assets, non-current  
Deferred tax liabilities, non-current
Trade accounts receivable [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 1,025,827 1,031,389
Inventories [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 1,600,189 1,715,161
Property, plant and equipment [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 275,832 618,416
Provision for product warranty [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current $ 550,324 $ 562,654