Property and Equipment, Net (Details 1) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,621,493	$ 9,222,774
Less - accumulated depreciation	(8,169,348)	(7,764,668)
Property and equipment, net	2,452,145	1,458,106
Shop machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,452,873	8,100,667
Computers and electronics [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	587,659	558,561
Office furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	337,394	341,214
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 243,567	$ 222,332

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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