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Leases (Tables)
 6 Months Ended
Jul. 31, 2015
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] At July 31, 2015, the Company has lease agreements, as lessee, for rail cars and a natural gas pipeline. All of the leases are accounted for as operating leases. The following table is a summary of future minimum rentals on such leases (amounts in thousands):

Years Ended January 31,   Minimum
Rentals		  
         
Remainder of 2016   $ 3,694  
2017     7,340  
2018     6,575  
2019     5,845  
2020     4,341  
Thereafter     6,947  
Total   $ 34,742