Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Convertible Preferred Stock [Member]
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, authorized (in shares)	5,000,000	5,000,000
Convertible preferred stock, issued (in shares)	0	0
Convertible preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	13,136,245	14,446,950
Common stock, outstanding (in shares)	13,136,245	14,446,950