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Note 2 - Allowance for Doubtful Accounts Receivable (Detail) - Allowance for Doubtful Accounts Receivable (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance	$ 758,000	$ 600,000
Provision for bad debts	74,000	239,000
Charge-offs	(125,000)	(90,000)
Recoveries	18,000	9,000
Balance	$ 725,000	$ 758,000

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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