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Note 4 - Fixed Assets (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    March 31,
2020
  December 31,
2019
Computers and office equipment   $
508,143
    $
508,143
 
Leasehold improvements    
188,014
     
188,014
 
Manufacturing tooling    
1,510,165
     
1,510,165
 
Demo equipment    
73,051
     
73,051
 
Total    
2,279,373
     
2,279,373
 
Less: Accumulated depreciation    
901,649
     
771,574
 
Total Fixed Assets, Net   $
1,377,724
    $
1,507,799