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Note 4 - Accounts Receivable
6 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.
Accounts Receivable
 
Accounts receivable consisted of the following (in thousands):
 
   
September 30,
2017
   
March 31,
2017
 
   
(unaudited)
 
Accounts receivable, gross
  $
45,929
    $
45,856
 
Allowances
   
(4,184
)    
(4,689
)
Accounts receivable, net
  $
41,745
    $
41,167