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v3.21.1

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

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