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Note 1 - Summary of Significant Accounting Policies (Detail) - Allowance for Doubtful Accounts Activities (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at beginning of year	$ 420	$ 444
Amounts charged to expense	153	59
Uncollectible accounts written off, net of recovery	(155)	(83)
Balance at end of year	$ 418	$ 420

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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