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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, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance, at beginning of year	$ 2,768	$ 2,405	$ 1,700
Charged to expense	397	451	396
Write-offs and adjustments	144	(88)	309
Balance, at end of year	$ 3,309	$ 2,768	$ 2,405

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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