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Segment Data (Details) (USD $)
3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Segment Reporting Information [Line Items]        
Net sales $ 25,092,772 $ 22,787,344 $ 73,210,278 $ 69,163,340
Sales Revenue, Percentage 100.00% 100.00% 100.00% 100.00%
Domestic [Member]
       
Segment Reporting Information [Line Items]        
Net sales 13,000,000 11,470,000 37,160,000 35,650,000
Sales Revenue, Percentage 51.80% 50.30% 50.80% 51.60%
International [Member]
       
Segment Reporting Information [Line Items]        
Net sales $ 12,090,000 $ 11,320,000 $ 36,050,000 $ 33,510,000
Sales Revenue, Percentage 48.20% 49.70% 49.20% 48.40%