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Note 1 - Summary of Operations and Significant Accounting Policies (Detail) - Changes in allowance for doubtful accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at beginning of year	$ 683	$ 490
Amounts charged (credited) to expense	9	237
Amounts credited to other accounts		(2)
Uncollectible accounts written-off, net of recovery	(370)	(42)
Balance at end of year	$ 322	$ 683

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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