Note 16 - Share-based Compensation (Details) - Summary of Information Concerning Stock Options Outstanding Including the Related Transactions under the Stock Option Plans (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Summary of Information Concerning Stock Options Outstanding Including the Related Transactions under the Stock Option Plans [Abstract]
Options Outstanding as of December 31, 2014	48,724
Options Outstanding as of December 31, 2014	$ 18.94
Granted	501
Granted	$ 22.70
Exercised	(5,351)
Exercised	$ 16.66
Forfeited and Expired	(25)
Forfeited and Expired	$ 20.47
Options Outstanding as of March 31, 2015	43,849
Options Outstanding as of March 31, 2015	$ 19.26
Options Outstanding as of March 31, 2015	4 years 156 days
Options Outstanding as of March 31, 2015	$ 188,767
Options Expected to Vest as of March 31, 2015	43,782
Options Expected to Vest as of March 31, 2015	$ 19.26
Options Expected to Vest as of March 31, 2015	4 years 153 days
Options Expected to Vest as of March 31, 2015	188,505
Options Exercisable as of March 31, 2015	37,293
Options Exercisable as of March 31, 2015	$ 19.73
Options Exercisable as of March 31, 2015	3 years 262 days
Options Exercisable as of March 31, 2015	$ 148,763