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Note 6 - Stockholders' Equity (Details) - Stock Option Activity (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2010
Stock Option Activity [Abstract]      
Outstanding 1,069,141   928,242
Outstanding (in Dollars per share) $ 4.50   $ 5.43
Outstanding   6 years 73 days  
Outstanding (in Dollars) $ 0    
Exercisable at December 31, 2012 679,036 698,995  
Exercisable at December 31, 2012 (in Dollars per share) $ 6.14 $ 6.38  
Exercisable at December 31, 2012   4 years 219 days  
Exercisable at December 31, 2012 (in Dollars)   0  
Granted   238,500  
Granted (in Dollars per share)   $ 0.70  
Exercised   0  
Exercised (in Dollars per share)   $ 0  
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
Outstanding   6 years 73 days  
Outstanding (in Dollars)   $ 0