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Retirement plans Plan assets (Tables)
12 Months Ended
Jan. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Allocation of Plan Assets [Table Text Block]
Level 1 market value of plan assets
2014

2013
Equity securities
$3,795
$3,340
U.S. bond market
2,033
2,453
Real estate securities

149
Subtotal
5,828
5,942
Level 2 significant other observable inputs
 
 
Money market fund
340
409
Total
$6,168
$6,351