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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Net operating loss carried forward $ 30,094,323 $ 29,361,274
Valuation allowance (33,541,535) (32,944,381)
Deferred tax assets, non-current
Deferred tax liabilities, non-current
Trade accounts receivable [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 1,281,707 1,225,916
Inventories [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 857,830 1,026,483
Property, plant and equipment [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current 772,532 768,975
Provision for product warranty [Member]    
Net operating loss carried forward  
Deferred tax assets, non-current $ 535,143 $ 561,733