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Note 8 - Convertible Stock Issued (Details) - shares
 1 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]          
Conversion of preferred stock (in shares) 202,857 0 202,857 2,048,570 1,882,667
Series B Convertible Preferred Stock [Member]          
Conversion of preferred stock (in shares)   0 4,428,571 0