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Note 6 - Stockholders' Equity - Stock Option Grant Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Granted (in shares) 150,000 161,582  
Granted, stock options, weighted average exercise price (in dollars per share) $ 1.25 $ 1.25  
The 2006 Plan [Member]      
Outstanding January 1, 2017 (in shares) 2,484,445    
Outstanding, stock options, weighted average exercise price, January 1, 2016 (in dollars per share) $ 1.18    
Outstanding, stock options, weighted average remaining contractual life, January 1, 2016 (Year) 8 years 62 days   9 years 299 days
Granted (in shares) 150,000    
Granted, stock options, weighted average exercise price (in dollars per share) $ 1.25    
Granted, stock options, weighted average remaining contractual life (Year) 4 years 219 days    
Expired (in shares) (21,146)    
Expired, stock options, weighted average exercise price (in dollars per share) $ 1    
Outstanding March 31, 2017 (in shares) 2,613,299   2,484,445
Outstanding, stock options, weighted average exercise price, December 31, 2016 (in dollars per share) $ 1.14   $ 1.18