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Pension plan
 3 Months Ended
Apr. 30, 2012
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
April 30, 2012

January 31, 2012

Equity securities

$3,133


$3,018

U.S. bond market
2,066

1,968

High-quality inflation-indexed bonds issued by the U.S. Treasury and government agencies as well as domestic corporations
270

268

Real estate
118

110

Subtotal
5,587

5,364

Level 2 significant other observable inputs
 
 
Money market fund
251

138

Total

$5,838


$5,502


 
Three Months Ended April 30,
Components of net periodic benefit costs
2012

2011

Service cost

$43


$31

Interest cost
75

74

Expected return on plan assets
(111
)
(101
)
Amortization of prior service cost
12

32

Recognized actuarial loss
43

9

Net periodic benefit costs

$62


$45


Employer contributions for the remainder of the fiscal year ending January 31, 2013 are expected to be $300 thousand. For the three months ended April 30, 2012, contributions of $192 thousand were made.