Note 17 - Stock Based Compensation - Summary of Stock Option Activity (Details) - Employee Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Outstanding, beginning balance (in shares)	1,631,913
Outstanding, beginning balance, weighted average exercise price (in dollars per share)	$ 19.17
Outstanding, beginning balance, weighted average options exercisable (in shares)	701,797	709,255
Granted (in shares)	299,230
Granted, weighted average exercise price (in dollars per share)	$ 40.95
Exercised (in shares)	(398,680)
Exercised, weighted average exercise price (in dollars per share)	$ 12.39
Forfeited or expired (in shares)	(13,125)
Forfeited or expired, weighted average exercise price (in dollars per share)	$ 21.85
Outstanding, ending balance (in shares)	1,519,338	1,631,913
Outstanding, ending balance, weighted average exercise price (in dollars per share)	$ 25.22	$ 19.17
Exercisable (in shares)	701,797	709,255
Exercisable, weighted average exercise price (in dollars per share)	$ 17.72