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Pension plan
 9 Months Ended
Oct. 31, 2011
Pension Plan [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
Pension plan. The Winchester filtration hourly rated employees are covered by a defined benefit plan. The major categories of the pension plan's investments remained the same.
Level 1 market value of plan assets
October 31, 2011

January 31, 2011

Equity securities

$2,918


$2,830

U.S. bond market
1,877

1,837

High-quality inflation-indexed bonds issued by the U.S. Treasury and government agencies as well as domestic corporations
261

229

Real estate
103

97

Subtotal
5,159

4,993

Level 2 significant other observable inputs
 
 
Money market fund
97

96

Total

$5,256


$5,089


 
Three Months Ended October 31,
 
Nine Months Ended October 31,
Components of net periodic benefit costs
2011

2010

 
2011

2010

Service cost

$31


$30

 

$94


$89

Interest cost
79

70

 
235

210

Expected return on plan assets
(101
)
(86
)
 
(304
)
(257
)
Amortization of prior service cost
31

33

 
95

99

Recognized actuarial loss
16

17

 
47

49

Net periodic benefit costs

$56


$64

 

$167


$190


Employer contributions for the remainder of the fiscal year ending January 31, 2012 are expected to be $239 thousand. For the nine months ended October 31, 2011, contributions of $183 thousand were made.