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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (unaudited) (Parenthetical) (USD $)	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Comprehensive income:
Interest rate swap, net of tax of	$ 22,656	$ 43,318
Purchase of treasury shares (in shares)	3,717	62,735

Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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