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Note 3 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,   December 31,
    2017   2016
Furniture and fixtures   $
38,540
     $
-
  
Leasehold improvements    
11,638
      
-
  
Computers    
53,704
      
4,657
  
Vehicles    
-
      
16,378
  
Test/Demo vehicles    
407,612
      
414,023
  
Total property and equipment    
511,494
      
435,058
  
Less accumulated depreciation    
(24,427
 )    
(17,868
 )
Net property and equipment   $
487,067
     $
417,190