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Note 3 - Supplemental Balance Sheet Information (Detail) - Allowance for Doubtful Accounts Activity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance, at beginning of year	$ 3,309	$ 2,768	$ 2,405
Charged to expense	428	397	451
Write-offs and adjustments	(485)	144	(88)
Balance, at end of year	$ 3,252	$ 3,309	$ 2,768

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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