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Note 6 - Equity-based Compensation - Stock Option Activities (Details) - $ / shares
6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Outstanding (in shares)   207,108 34,190 34,190
Outstanding, weighted average exercise price (in dollars per share) $ 9.65 $ 14.71 $ 9.65 $ 14.18
Outstanding, average remaining contractual term (Year) 2 years 109 days 6 years 73 days 2 years 6 years 73 days
Granted (in shares)   5,000 0  
Granted, weighted average exercise price (in dollars per share)   $ 15.48 $ 0  
Granted, average remaining contractual term (Year)   6 years 255 days 0 years  
Exercised (in shares)   (15,464) 0  
Exercised, weighted average exercise price (in dollars per share)   $ 9.65 $ 0  
Forfeited or expired (in shares)   (7,734) 0  
Forfeited or expired, weighted average exercise price (in dollars per share)   $ 11.08 $ 0  
Outstanding (in shares) 34,190 188,910 34,190 207,108
Exercisable (in shares)   7,260 34,190  
Exercisable, weighted average exercise price (in dollars per share)   $ 9.65 $ 9.65  
Exercisable, average remaining contractual term (Year)   1 year 2 years