Note 13 - Stock-Based Compensation (Details) - Summary of Outstanding Stock Options (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 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 March 31, 2014	120,741
Options exercisable at March 31, 2014	$ 45.62
Options exercisable at March 31, 2014	$ 1,225,000
Number of Shares - Options Granted	13,300	59,472
Weighted Average Exercise Price - Options Granted	$ 53.72	$ 47.95
Number of Shares - Options Exercised	(141,706)	(21,522)
Weighted Average Exercise Price - Options Exercised	$ 45.70	$ 45.63
Options cancelled		(98,000)
Options cancelled		$ 51.11
Number of Shares - Options Outstanding	946,146	1,074,552
Weighted Average Exercise Price - Options Outstanding	$ 46.65	$ 46.44
Aggregate Intrinsic Value - Options Outstanding	$ 8,626,000