Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Stockholders' equity :
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	22,586,020	22,135,770
Common stock, shares outstanding	22,586,020	22,135,770