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Long-Term Debt (tables)
 12 Months Ended
Mar. 31, 2013
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
5. Long-Term Debt    
     
  2013 2012
  (In thousands)
Revolving credit facility,    
1.70% and 1.69%, due through 2017$188,000$144,149
Secured note payable to insurance company,     
8.03%, due through 2014 38,138 43,452
Secured Industrial Revenue Development Bonds,     
3.29%, and 3.38%, due through 2029 22,630 22,630
Secured promissory note,    
6.98%, due through 2022 16,753 18,096
Secured promissory note,    
6.35%, due through 2020 4,303 4,840
Secured Industrial Revenue Development Bond,    
8.10%, paid in 2013 0 661
Other 362 381
  270,186 234,209
Less current portion 40,170 7,336
 $230,016$226,873
Long Term Debt Repayement [table text block]
Years ending March 31: 
2014 $40,170 
2015  2,175 
2016  2,332 
2017  190,466 
2018  7,699 
Thereafter  27,344 
Total $270,186