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QUARTERLY HIGHLIGHTS (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
QUARTERLY HIGHLIGHTS [Abstract]                      
Sales and service fees $ 56,067 $ 49,959 $ 45,965 $ 51,126 $ 48,571 $ 50,573 $ 41,576 $ 39,680 $ 203,117 $ 180,400 $ 105,893
Gross profit 17,220 16,084 13,393 16,484 15,682 15,850 12,651 11,691 63,181 55,874 21,796
Gross profit margin 30.70% 32.20% 29.10% 32.20% 32.30% 31.30% 30.40% 29.50%      
Selling, general and administrative expenses 11,870 10,272 9,288 9,730 11,092 9,317 9,254 8,830 41,160 38,493 29,837
Operating income (loss) 5,350 5,812 4,105 6,754 4,590 6,533 3,397 2,861 22,021 17,381 (8,041)
Provision for income taxes 1,219 1,641 1,103 2,263 840 1,706 1,050 899 6,226 4,495 (3,115)
Net income $ 4,086 $ 3,957 $ 2,962 $ 4,633 $ 2,654 $ 4,575 $ 2,349 $ 1,546 $ 15,638 $ 11,124 $ (5,744)
Earnings (loss) per common share - basic $ 0.63 $ 0.61 $ 0.46 $ 0.71 $ 0.41 $ 0.71 $ 0.36 $ 0.24 $ 2.41 $ 1.72 $ (0.89)
Earnings (loss) per common share - diluted $ 0.63 $ 0.61 $ 0.45 $ 0.71 $ 0.41 $ 0.7 $ 0.36 $ 0.24 $ 2.4 $ 1.71 $ (0.89)