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Fair value of financial instruments
3 Months Ended
Apr. 30, 2012
Fair value of financial instruments  
Fair Value Disclosures [Text Block]
Fair value of financial instruments. At April 30, 2012, one interest rate swap agreement was in effect with a notional value of $9 million that matures November 2013. The swap agreement, which reduces the exposure to market risks from changing interest rates, exchanges the variable rate to fixed interest rate payments of 2.23% plus LIBOR margin. The exchange-traded swap is valued on a recurring basis using quoted market prices and was classified within Level 2 of the fair value hierarchy because the exchange is not deemed to be an active market. The derivative mark to market of $272 thousand was classified as a long-term liability on the balance sheet.