Property and Equipment (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 275,420	$ 176,955	$ 253,444
Less - accumulated depreciation	(145,574)	(123,725)	(97,507)
Property and equipment, net	129,846	53,230	155,937
Shop machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	147,194	87,534	87,704
Computers and electronics [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,398	32,093	35,270
Office furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,080	37,814	37,814
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 37,748	$ 19,514	$ 19,514

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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