Note 13 - Stock-Based Compensation (Details) - Summary of Outstanding Stock Options (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Summary of Outstanding Stock Options [Abstract]
Number of Shares - Options Outstanding	1,074,552	1,134,602
Weighted Average Exercise Price - Options Outstanding	$ 46.44	$ 46.75
Options exercisable at June 30, 2014	158,573
Options exercisable at June 30, 2014	$ 48.06
Options exercisable at June 30, 2014	$ 1,306,000
Number of Shares - Options Granted	58,249	59,472
Weighted Average Exercise Price - Options Granted	$ 53.11	$ 47.95
Number of Shares - Options Exercised	(148,974)	(21,522)
Weighted Average Exercise Price - Options Exercised	$ 45.32	$ 45.63
Options cancelled		(98,000)
Options cancelled		$ 51.11
Number of Shares - Options Outstanding	983,827	1,074,552
Weighted Average Exercise Price - Options Outstanding	$ 47.00	$ 46.44
Aggregate Intrinsic Value - Options Outstanding	$ 9,136,000