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Note 6 - Stockholders' Equity - Summary of Warrants (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Outstanding (in shares) 3,826,658  
Outstanding, weighted average exercise price (in dollars per share) $ 1.02  
Outstanding, weighted average exercise price (in dollars per share) $ 1.05 $ 1.02
Outstanding, weighted average remaining life (Year) 5 years 94 days 5 years 262 days
Expired (in shares) 100,000  
Expired, weighted average exercise price (in dollars per share) $ 1.25  
Outstanding (in shares) 3,726,658 3,826,658