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Note 9 - Warrant Liability (Tables)
9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Balance at March 31, 2018
  $
-
 
Issuance of Warrants
   
940
 
Change in fair value
   
(113
)
Balance at December 31, 2018
  $
827