Note 8 - Stock-Based Compensation (Details) - Stock Options Exercised (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock Options Exercised [Abstract]
Proceeds from stock options exercised	$ 82	$ 77	$ 512	$ 312
Fair value of shares received upon exercised of stock options		2,323	1,290	4,074
Tax benefit related to stock options exercised	1	(71)	94	97
Intrinsic value of stock options exercised	$ 18	$ 436	$ 335	$ 813