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Note 6 - Stockholders' Equity (Details) - Stock Purchase Warrant Transactions (USD $)
 9 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Series A Warrants [Member]
May 14, 2013
Series B Warrants [Member]
Jan. 17, 2013
Series B Warrants [Member]
Jan. 31, 2013
Series B Warrants [Member]
Dec. 31, 2012
Series B Warrants [Member]
Dec. 31, 2012
Series C Warrants [Member]
Dec. 31, 2012
Other Warrants [Member]
Class of Warrant or Right [Line Items]                    
Outstanding (in Shares) 8,292,226 11,225,559 1,870,559     1,166,667        
Outstanding (in Dollars per share) $ 2.53 $ 2.06 $ 7.96              
Exercisable at December 31, 2012 (in Shares) 8,292,226 8,290,376                
Exercisable at December 31, 2012 $ 2.53 $ 2.44                
Number of Shares (in Dollars)       $ 2,933,333 [1]       $ 2,933,333 [1] $ 2,933,333 [1] $ 612,001 [2]
Weighted Average Exercise Price       $ 1.00 [1]       $ 0.75 [1] $ 1.00 [1] $ 1.00 [2]
Exercised (in Shares) (2,933,333) 0     1,166,666 1,766,667 1,766,667      
Exercised $ 0.56 $ 0                
Forfeited or expired (in Shares)   (57,000)                
Forfeited or expired   $ 7.00                
[1] See discussion under "Series A Convertible Preferred Stock" above.
[2] See discussion under "Common Stock Transactions" above.