Annual report pursuant to Section 13 and 15(d)

Note 10 - Equity - Stock Options Activity (Details)

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Note 10 - Equity - Stock Options Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Granted at Market Price, Number of Shares (in shares) 145,792 295,286  
Employee Stock Option [Member]      
Outstanding, Number of Shares (in shares) 1,003,916 953,075  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.72 $ 4.18 $ 3.66
Outstanding, Weighted Average Fair Value (in dollars per share) $ 2.09 $ 1.87 $ 1.86
Outstanding, Weighted Average Remaining Contractual Life (Year) 6 years 292 days 8 years 36 days 6 years 328 days
Granted at Market Price, Number of Shares (in shares) 145,792 295,286  
Granted at Market Price, Weighted Average Exercise Price (in dollars per share) $ 7 $ 4.31  
Exercised, Number of Shares (in shares) (95,162) (206,875)  
Exercised, Weighted Average Exercise Price (in dollars per share) $ 3.48 $ 1.76  
Cancelled, Number of Shares (in shares) (67,855) (37,570)  
Cancelled, Weighted Average Exercise Price (in dollars per share) $ 3.37 $ 5.11  
Outstanding, Number of Shares (in shares) 986,691 1,003,916 953,075
Exercisable, Number of Shares (in shares) 497,667    
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.76    
Exercisable, Weighted Average Fair Value (in dollars per share) $ 2.10    
Exercisable, Weighted Average Remaining Contractual Life (Year) 6 years 292 days