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Fair Value (table)
12 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
10. Fair Value of Financial Instruments
         
The carrying amount and estimated fair values of the Company's debt are summarized as follows:
         
  2013 2012
  Carrying Estimated Carrying Estimated
  Amount Fair Value Amount Fair Value
   (In thousands)
Long-term debt, including         
current portion$270,186$273,567$234,209$231,416