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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares                      
Net income Basic (in shares)                 16,140,078 16,138,158 16,131,321
Effect of dilutive stock options (in shares)                 110,000 93,000 75,000
Diluted (in shares)                 16,250,088 16,231,325 16,205,606
Per Share Amount                      
Net income Basic (in dollars per share) $ 0.08 $ 0.26 $ 0.11 $ 0.10 $ 0.04 $ 0.00 $ 0.22 $ 0.10 $ 0.55 $ 0.35 $ 0.51
Diluted (in dollars per share) $ 0.08 $ 0.25 $ 0.11 $ 0.10 $ 0.03 $ 0.00 $ 0.22 $ 0.09 $ 0.55 $ 0.35 $ 0.51
Stock options
                      
Anti-dilutive securities                      
Options to purchase shares of common stock                 1,518,000 1,720,000 1,715,000
Exercise prices, low end of range (in dollars per share)                 $ 11.00 $ 10.43 $ 10.43
Exercise prices, high end of range (in dollars per share)                 $ 29.00 $ 29.00 $ 29.00