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