Note 8 - Equity Plans (Detail) - Stock Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Outstanding, Number of Options	38,672		40,339
Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 22.58		$ 21.79
Outstanding, Weighted Average Remaining Contractual Term	2 years 255 days
Outstanding, Aggregate Intrinsic Value (in Dollars)	$ 240
Exercisable at March 31, 2013	38,672
Exercisable at March 31, 2013 (in Dollars per share)	$ 22.58
Exercisable at March 31, 2013	2 years 255 days
Exercisable at March 31, 2013 (in Dollars)	$ 240
Granted	0
Granted (in Dollars per share)	$ 0
Exercised	(1,667)	(2,170)
Exercised (in Dollars per share)	$ 3.50
Canceled	0
Canceled (in Dollars per share)	$ 0