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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Net Sales $ 20,562,076 $ 19,568,600 $ 58,559,205 $ 58,764,264
Cost of Sales 11,724,077 11,554,870 34,051,302 35,348,220
Gross Profit 8,837,999 8,013,730 24,507,903 23,416,044
Costs and Expenses:        
Selling and Marketing 4,431,135 4,554,875 12,972,867 13,646,526
General and Administrative 1,187,354 1,009,145 3,338,997 2,884,286
Research and Development 1,126,319 1,261,632 3,537,646 3,916,899
Operating Expenses 6,744,808 6,825,652 19,849,510 20,447,711
Operating Income 2,093,191 1,188,078 4,658,393 2,968,333
Other Income (Expense) 46,651 (68,663) (56,377) 378,619
Income Before Income Taxes 2,139,842 1,119,415 4,602,016 3,346,952
Income Tax Provision 832,388 319,428 1,470,974 1,069,688
Net Income $ 1,307,454 $ 799,987 $ 3,131,042 $ 2,277,264
Net Income per Common Share:        
Basic $ 0.18 $ 0.11 $ 0.42 $ 0.31
Diluted $ 0.18 $ 0.11 $ 0.42 $ 0.31
Weighted Average Number of Shares Outstanding:        
Basic 7,379,094 7,339,639 7,414,273 7,300,167
Diluted 7,461,958 7,420,835 7,486,588 7,422,787
Dividends Declared Per Common Share $ 0.07 $ 0.07 $ 0.21 $ 0.21