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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Net operating loss carried forward $ 26,595,654 $ 25,892,299
Valuation allowance (30,559,274) (30,114,111)
Deferred tax assets, non-current
Deferred tax liabilities, non-current
Trade accounts receivable [Member]    
Deferred tax assets, non-current 1,031,389 1,098,183
Inventories [Member]    
Deferred tax assets, non-current 1,751,161 1,772,444
Property, plant and equipment [Member]    
Deferred tax assets, non-current 618,416 781,227
Provision for product warranty [Member]    
Deferred tax assets, non-current $ 562,654 $ 569,958