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Note 5 - Accounts Receivable
9 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
5. Accounts Receivable
 
Accounts receivable consist of the following (in thousands):
 
 
 
December 31,
2015
 
 
March 31,
2015
 
 
 
(unaudited)
 
Accounts receivable, gross
  $ 38,490     $ 43,810  
Allowance for doubtful accounts
    (2,310 )     (2,768 )
Accounts receivable, net
  $ 36,180     $ 41,042