Note 18 - Stock-based Compensation - Stock option Activities (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding, weighted average exercise price (in dollars per share)	$ 9.65	$ 9.65
Outstanding, average remaining contractual term (Year)	6 years 73 days	2 years 109 days	3 years 36 days
Granted (in shares)	178,650	0
Granted, weighted average exercise price (in dollars per share)	$ 14.90	$ 0
Granted, Average Remaining contractual Term (Year)	6 years 328 days
Exercised (in shares)	(5,732)	0
Exercised, weighted average exercise price (in dollars per share)	$ 9.65	$ 0
Forfeited or expired (in shares)	0	(2,702)
Forfeited or expired, weighted average exercise price (in dollars per share)	$ 0	$ 9.65
Outstanding (in shares)	207,108	34,190	36,892
Outstanding, weighted average exercise price (in dollars per share)	$ 14.18	$ 9.65	$ 9.65
Exercisable (in shares)	28,458	34,190
Exercisable, weighted average exercise price (in dollars per share)	$ 9.65	$ 9.65
Exercisable, average remaining contractual term (Year)	1 year 109 days	2 years 109 days
Outstanding (in shares)	34,190	36,892