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SELECTED QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Jan. 31, 2013
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Oct. 31, 2012
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Jul. 31, 2012
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Apr. 30, 2012
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Jan. 31, 2012
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Oct. 31, 2011
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Jul. 31, 2011
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Apr. 30, 2011
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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| SELECTED QUARTERLY FINANCIAL INFORMATION (Unaudited) [Abstract] | |||||||||||
| Net Sales | $ 26,976,263 | $ 29,761,356 | $ 27,997,242 | $ 25,207,061 | $ 28,397,015 | $ 25,245,131 | $ 23,089,343 | $ 23,429,903 | $ 109,941,922 | $ 100,161,392 | $ 88,865,426 |
| Gross Profit | 9,473,878 | 10,664,515 | 8,698,104 | 8,950,526 | 9,838,973 | 9,334,848 | 8,136,981 | 8,058,205 | 37,787,023 | 35,369,007 | 32,278,100 |
| Net Income | $ 2,375,791 | $ 2,790,735 | $ 1,619,999 | $ 1,258,698 | $ 2,149,074 | $ 2,081,886 | $ 1,490,234 | $ 1,412,507 | $ 8,045,223 | $ 7,133,701 | $ 6,139,132 |
| Earnings Per Share, Basic (in dollars per share) | $ 0.16 | $ 0.19 | $ 0.11 | $ 0.09 | $ 0.15 | $ 0.14 | $ 0.10 | $ 0.10 | $ 0.55 | $ 0.49 | $ 0.42 |
| Earnings Per Share, Diluted (in dollars per share) | $ 0.16 | $ 0.19 | $ 0.11 | $ 0.09 | $ 0.15 | $ 0.14 | $ 0.10 | $ 0.10 | $ 0.55 | $ 0.48 | $ 0.42 |