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Note 4 - Property and Equipment (Tables)
 3 Months Ended
Jun. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30, 2020
    
March 31,2020
  
Machinery and equipment
   $
199,810
     $
199,810
  
Leasehold improvements
    
3,750
      
3,750
  
     
203,560
      
203,560
  
                 
Accumulated depreciation and amortization
    
(154,978
)
    
(145,602
)
                 
Property and equipment, net
   $
48,582
     $
57,958