Note 3 - Supplemental Balance Sheet Information Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, at beginning of year	$ 2,953	$ 3,077	$ 2,536
Charged to expense	1,043	428	397
Write-offs and adjustments	(555)	(552)	144
Balance, at beginning of year	$ 3,441	$ 2,953	$ 3,077