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Note 3 - Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Property and equipment, gross $ 196,988 $ 511,494
Less accumulated depreciation (52,006) (24,427)
Property and equipment, net 144,982 487,067
Furniture and Fixtures [Member]    
Property and equipment, gross 41,799 38,540
Leasehold Improvements [Member]    
Property and equipment, gross 11,638 11,638
Computer Equipment [Member]    
Property and equipment, gross 53,704 53,704
Vehicles [Member]    
Property and equipment, gross 67,299
Test/Demo Vehicles [Member]    
Property and equipment, gross $ 22,548 $ 407,612