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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Potential Shares of Common Stock Excluded from Diluted Net Loss Per Share (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock [Member]    
Anti-dilutive Securities (in shares) 92,415 339,288
Employee Stock Option [Member]    
Anti-dilutive Securities (in shares) 953,075 477,459
Warrant [Member]    
Anti-dilutive Securities (in shares) 90,000 90,000