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Consolidated Statements Of Operations (USD $)
 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Consolidated Statements Of Operations [Abstract]    
Net Sales $ 79,193,202 $ 71,016,111
Cost of Sales 47,410,034 42,349,870
Gross Profit 31,783,168 28,666,241
Costs and Expenses:    
Selling and Marketing 17,979,996 16,690,197
General and Administrative 3,961,557 4,300,525
Research and Development 5,243,460 5,020,020
Operating Expenses 27,185,013 26,010,742
Loss on Sale of Asheboro Operations (681,440)  
Gain on Legal Settlement   104,448
Operating Income 3,916,715 2,759,947
Other Income:    
Investment Income 81,781 49,040
Other, Net 233,997 (25,373)
Other Income (Expense) 315,778 23,667
Income before Income Taxes 4,232,493 2,783,614
Income Tax Provision 1,100,802 721,845
Net Income $ 3,131,691 $ 2,061,769
Net Income Per Common Share-Basic $ 0.43 $ 0.28
Net Income Per Common Share-Diluted $ 0.42 $ 0.28
Weighted Average Number of Common Shares Outstanding-Basic 7,324,568 7,271,403
Dilutive effect of options outstanding 104,406 198,357
Weighted Average Number of Common Shares Outstanding-Diluted 7,428,974 7,469,760
Dividends Declared Per Common Share $ 0.28 $ 0.28