Annual report pursuant to Section 13 and 15(d)

Note 8 - Equity - Stock Options Activity (Details)

v3.8.0.1
Note 8 - Equity - Stock Options Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Granted at Market Price, Number of Shares (in shares) 295,286 660,000  
Employee Stock Option [Member]      
Outstanding, Number of Shares (in shares) 953,075 477,459  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.66 $ 4.30  
Outstanding, Weighted Average Fair Value (in dollars per share) $ 1.87 $ 1.86 $ 2.01
Outstanding, Weighted Average Remaining Contractual Life (Year) 8 years 36 days 6 years 328 days 8 years 255 days
Granted at Market Price, Number of Shares (in shares) 295,286 660,000  
Granted at Market Price, Weighted Average Exercise Price (in dollars per share) $ 4.31 $ 3.22  
Exercised, Number of Shares (in shares) (206,875) (37,824)  
Exercised, Weighted Average Exercise Price (in dollars per share) $ 1.76 $ 1.88  
Cancelled, Number of Shares (in shares) (37,570) (146,560)  
Cancelled, Weighted Average Exercise Price (in dollars per share) $ 5.11 $ 4.34  
Outstanding, Number of Shares (in shares) 1,003,916 953,075 477,459
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.18 $ 3.66 $ 4.30
Exercisable, Number of Shares (in shares) 287,230    
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.37    
Exercisable, Weighted Average Fair Value (in dollars per share) $ 2.38    
Exercisable, Weighted Average Remaining Contractual Life (Year) 7 years 146 days