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Note 8 - Common Stock - Convertible Stock Issued (Details) - shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Series A Convertible Preferred Stock [Member]      
Conversions of Preferred Stock (in shares) 0 0 202,857
Series B Convertible Preferred Stock [Member]      
Conversions of Preferred Stock (in shares) 0 0 4,428,571
Series C Convertible Preferred Stock [Member]      
Conversions of Preferred Stock (in shares) 1,400,000 0 0