Note 8 - Stock-Based Compensation (Details) - Stock Options Exercised (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock Options Exercised [Abstract]
Proceeds from stock options exercised	$ 87	$ 212	$ 429	$ 235
Fair value of shares received upon exercised of stock options	812	937	1,290	1,574
Tax benefit related to stock options exercised	24	115	93	168
Intrinsic value of stock options exercised	$ 105	$ 203	$ 317	$ 377