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Significant accounting policies Accumulated other comprehensive loss (Tables)
 12 Months Ended
Jan. 31, 2013
Accumulated other comprehensive loss [Abstract]  
Accumulated other comprehensive loss [Table Text Block]
 
2012

2011

Equity adjustment foreign currency

$1,179


$1,442

Minimum pension liability, gross
(2,479
)
(2,945
)
Interest rate swap, gross
(219
)
(316
)
Subtotal excluding tax effect
(1,519
)
(1,819
)
Tax effect of foreign exchange
12

—

Tax effect of minimum pension liability
765

1,119

Tax effect of interest rate swap
17

120

Total other comprehensive loss
($725)
($580)