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Pension plan (Tables)

6 Months Ended

Jul. 31, 2012

Pension plan [Abstract]

Market value of plan assets [Table Text Block]

Level 1 market value of plan assets	July 31, 2012			January 31, 2012
Equity securities		$3,151			$3,018
U.S. bond market	2,060			1,968
High-quality inflation-indexed bonds issued by the U.S. Treasury and government agencies as well as domestic corporations	278			268
Real estate	121			110
Subtotal	5,610			5,364
Level 2 significant other observable inputs
Money market fund	299			138
Total		$5,909			$5,502

Components of net periodic benefit costs[Table Text Block]

	Three Months Ended July 31,							Six Months Ended July 31,
Components of net periodic benefit costs	2012			2011				2012			2011
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

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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