Note 8 - Stock-Based Compensation (Details) - Non-Full Value Awards (Employee Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Employee Stock Option [Member]
Note 8 - Stock-Based Compensation (Details) - Non-Full Value Awards [Line Items]
Outstanding, Shares	256,415		306,630
Outstanding, Weighted-Average Exercise Price	$ 15.95		$ 16.02
Outstanding, Weighted-Average Remaining Contractual Term	3 years 73 days
Outstanding, Aggregate Intrinsic Value	$ 1,312	[1]
Exercisable shares at March 31, 2014	256,415
Exercisable shares at March 31, 2014	$ 15.95
Exercisable shares at March 31, 2014	3 years 73 days
Exercisable shares at March 31, 2014	$ 1,312	[1]
Exercised	(50,215)
Exercised	$ 16.33

[1] The intrinsic value of a stock option is the difference between the market value of the underlying stock and the exercise price of the option.