Note 14 - Stock Incentive and Employee Benefit Plans (Details) - Unvested Restricted Stock Activity - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 14 - Stock Incentive and Employee Benefit Plans (Details) - Unvested Restricted Stock Activity [Line Items]
Outstanding, beginning of year	154,143	107,706	68,890
Outstanding, beginning of year	$ 37.55	$ 33.60	$ 21.55
Granted	133,616	94,590	63,529
Granted	$ 41.89	$ 39.20	$ 41.95
Vested	(82,293)	(42,310)	(22,964)
Vested	$ 35.75	$ 31.60	$ 21.55
Canceled	(10,439)	(5,843)	(1,748)
Canceled	$ 41.26	$ 33.65	$ 21.45
Outstanding, end of year	195,027	154,143	107,706
Outstanding, end of year	$ 41.08	$ 37.55	$ 33.60