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Pension plan (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2012
Jan. 31, 2012
Jul. 31, 2012
Equity Securities [Member]
Jan. 31, 2012
Equity Securities [Member]
Jul. 31, 2012
Bonds [Member]
Jan. 31, 2012
Bonds [Member]
Jul. 31, 2012
US Treasury and Government [Member]
Jan. 31, 2012
US Treasury and Government [Member]
Jul. 31, 2012
Real Estate Funds [Member]
Jan. 31, 2012
Real Estate Funds [Member]
Jul. 31, 2012
Money Market Funds [Member]
Jan. 31, 2012
Money Market Funds [Member]
Jul. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jul. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jul. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jul. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension plan [Line Items]                                
Service cost                         $ 42 $ 32 $ 85 $ 63
Interest cost                         74 82 149 156
Expected return on plan assets                         (111) (102) (222) (203)
Amortization of prior service cost                         13 32 25 64
Recognized actuarial loss                         44 22 87 31
Net periodic benefit costs                         62 66 124 111
Equity securities     3,151 3,018                        
Available-for-sale Securities, Fair Value Disclosure 5,610 5,364     2,060 1,968 278 268                
Real Estate                 121 110            
Money market Fund                     299 138        
Defined Benefit Plan, Fair Value of Plan Assets 5,909 5,502                            
Employer contributions for remaining fiscal year 200                              
Pension Contributions $ 292