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Note 4 - Property and Equipment (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2019
    
2018
  
Machinery and equipment
   $
199,810
     $
199,810
  
Leasehold improvements
    
3,750
      
3,750
  
     
203,560
      
203,560
  
                 
Accumulated depreciation and amortization
    
(108,099
 )    
(70,440
 )
                 
Property and equipment, net
   $
95,461
     $
133,120