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Note 5 - Stockholders' Equity (Details) - Share-based Compensation, Stock Options, Activity (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2010
Share-based Compensation, Stock Options, Activity [Abstract]      
Outstanding 1,069,141   928,242
Outstanding (in Dollars per share) $ 4.50   $ 5.43
Exercisable at September 30, 2013 679,036 698,995  
Exercisable at September 30, 2013 (in Dollars per share) $ 6.14 $ 6.38  
Forfeited or expired (78,429) 97,601  
Forfeited or expired (in Dollars per share) $ 4.86 $ 4.02  
Outstanding 990,712 1,069,141 928,242
Outstanding (in Dollars per share) $ 4.47 $ 4.50 $ 5.43