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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Net operating loss carried forward $ 31,060,254 $ 29,361,274
Valuation allowance (34,760,478) (32,944,381)
Deferred tax assets, non-current
Deferred tax liabilities, non-current
Trade accounts receivable [Member]    
Deferred tax assets, non-current 1,354,762 1,225,916
Inventories [Member]    
Deferred tax assets, non-current 575,575 1,026,483
Property, plant and equipment [Member]    
Deferred tax assets, non-current 1,271,986 768,975
Provision for product warranty [Member]    
Deferred tax assets, non-current $ 497,901 $ 561,733