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Note 3 - Stock-based Compensation and Shareholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended 186 Months Ended 6 Months Ended 102 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
1998 Plan [Member]
Jun. 30, 2013
2005 Plan [Member]
Jun. 30, 2013
2005 Plan [Member]
Note 3 - Stock-based Compensation and Shareholders' Equity (Details) [Line Items]                
Employee Benefits and Share-based Compensation (in Dollars) $ 24,000 $ 26,000 $ 30,000 $ 42,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars) $ 121,000   $ 121,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     31 months          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           220,500 200,000 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     20,000     225,058   143,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period           30,444   45,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     28,725     164,814   11,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 116,900   116,900   128,225 29,800 87,100 87,100
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award             The terms of the 2005 Plan are identical to the 1998 Plan, except options expire five years after the grant date.  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)     $ 4.52 $ 3.81