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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details 2) - USD ($)	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Net operating loss carried forward		$ 29,760,711	$ 29,361,274
Valuation allowance		(33,377,262)	(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		1,360,621	1,225,916
Inventories [Member]
Net operating loss carried forward
Deferred tax assets, non-current	$ 940,801		1,026,483
Property, plant and equipment [Member]
Net operating loss carried forward
Deferred tax assets, non-current		763,598	768,975
Provision for product warranty [Member]
Net operating loss carried forward
Deferred tax assets, non-current		$ 551,531	$ 561,733