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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Net operating loss carried forward $ 27,856,157 $ 26,595,654
Valuation allowance (31,688,931) (30,523,274)
Deferred tax assets, non-current
Deferred tax liabilities, non-current
Trade accounts receivable [Member]    
Deferred tax assets, non-current 1,029,625 1,031,389
Inventories [Member]    
Deferred tax assets, non-current 1,856,103 1,715,161
Property, plant and equipment [Member]    
Deferred tax assets, non-current 375,450 618,416
Provision for product warranty [Member]    
Deferred tax assets, non-current $ 571,596 $ 562,654