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Note 9 - Note Receivable (Tables)
 3 Months Ended
Jun. 30, 2019
Notes Tables  
Notes Receivable [Table Text Block]
Current assets
  
June 30, 2019
   
March 31, 2019
 
Note receivable, current
   $
-
     $
3,000
  
Note receivable discount
    
—
      
(112
 )
Total current note receivable
   $
-
     $
2,888