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Note 4 - Valuation and Qualifying Accounts (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable $ 112,000 $ 81,000
Valuation Allowances And Reserves Adjustment Percentage 25.00%  
Valuation Allowances and Reserves, Balance $ 0