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Note 5 - Accounts Receivable (Tables)
 9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
December 31,
2016
 
 
March 31,
2016
 
 
 
(unaudited)
 
Accounts receivable, gross
   $
40,276
     $
41,219
  
Allowances
    
(3,561
 )    
(2,779
 )
Accounts receivable, net
   $
36,715
     $
38,440