Note 16 - Summary of Nonvested Stock Options (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Nonvested Stock Option [Member]
Nonvested Stock Options (in shares) | shares	1,098,875
Nonvested Stock Options (in dollars per share) | $ / shares	$ 7.14
Granted Stock Options (in shares) | shares	333,601
Granted Stock Options (in dollars per share) | $ / shares	$ 15.29
Vested during period (in shares) | shares	(429,443)
Vested during period (in dollars per share) | $ / shares	$ 6.62
Forfeited (in shares) | shares	(80,375)
Forfeited (in dollars per share) | $ / shares	$ 6.90
Nonvested Stock Options (in shares) | shares	922,658
Nonvested Stock Options (in dollars per share) | $ / shares	$ 10.35
Restricted Stock [Member]
Nonvested Restricted Stock (in shares) | shares	0
Nonvested Restricted Stock (in dollars per share) | $ / shares	$ 0
Granted (in shares) | shares	9,075
Granted (in dollars per share) | $ / shares	$ 39.48
Vested during period (in shares) | shares	(8,897)
Vested during period (in dollars per share) | $ / shares	$ 39.34
Nonvested Restricted Stock (in shares) | shares	178
Nonvested Restricted Stock (in dollars per share) | $ / shares	$ 46.91