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Consolidated Statements of Income (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
NET SALES $ 66,102,947 $ 59,892,870 $ 54,482,739
COST OF SALES 25,765,788 23,642,013 21,873,365
Gross Profit 40,337,159 36,250,857 32,609,374
OPERATING EXPENSES 32,630,509 29,615,246 27,514,273
INCOME FROM OPERATIONS 7,706,650 6,635,611 5,095,101
OTHER (INCOME) EXPENSE:      
Interest expense 248,576 265,405 297,864
Other, net (83,428) (105,540) (164,165)
Total other expense 165,148 159,865 133,699
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 7,541,502 6,475,746 4,961,402
PROVISION FOR INCOME TAXES 2,787,533 2,317,255 1,700,259
NET INCOME FROM CONTINUING OPERATIONS 4,753,969 4,158,491 3,261,143
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX (1,368) 1,766 56,914
NET INCOME $ 4,752,601 $ 4,160,257 $ 3,318,057
NET INCOME FROM CONTINUING OPERATIONS PER COMMON SHARE:      
BASIC $ 0.47 $ 0.41 $ 0.31
DILUTED $ 0.47 $ 0.41 $ 0.31
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX PER COMMON SHARE:      
BASIC $ 0.00 $ 0.00 $ 0.01
DILUTED $ 0.00 $ 0.00 $ 0.01
NET INCOME PER COMMON SHARE:      
BASIC $ 0.47 $ 0.41 $ 0.32
DILUTED $ 0.47 $ 0.41 $ 0.31
Weighted Average Number of Shares Outstanding:      
Basic 10,156,442 10,208,944 10,471,103
Diluted 10,182,098 10,251,863 10,535,736