Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	24,308,452	24,289,723
Common stock, shares outstanding	22,533,608	22,514,879
Treasury stock, shares	1,774,844	1,774,844