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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Accounts receivable, allowance for sales returns and doubtful accounts $ 518,000 $ 504,000
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, authorized 1,500,000 1,500,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 20,000,000 20,000,000
Common stock, issued 15,525,955 15,510,185
Common stock, outstanding 15,525,955 15,510,185
Common stock in treasury, shares 1,458,908 1,458,908