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Note 6 - Stockholders' Equity (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 138 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Feb. 28, 2010
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2006
Dec. 31, 2005
Dec. 31, 2004
Dec. 31, 2003
Dec. 31, 2002
Dec. 31, 2012
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2010
Stock Options [Member]
Dec. 31, 2006
Stock Options [Member]
Dec. 31, 2012
Series A Warrants [Member]
Jan. 31, 2013
Series B Warrants [Member]
Dec. 31, 2012
Series B Warrants [Member]
Jan. 17, 2013
Series B Warrants [Member]
Dec. 31, 2012
Series C Warrants [Member]
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]
Mar. 31, 2012
Series A Convertible Preferred Stock [Member]
Dec. 31, 2011
Series A Convertible Preferred Stock [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Common Stock Issued for Services [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Common Stock Issued for Services [Member]
Dec. 31, 2010
General and Administrative Expense [Member]
Common Stock Issued for Services [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Compensatory Warrants [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Compensatory Warrants [Member]
Dec. 31, 2010
General and Administrative Expense [Member]
Compensatory Warrants [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Dec. 31, 2010
General and Administrative Expense [Member]
Jan. 31, 2012
Individual Accredited Investors [Member]
Dec. 31, 2011
Individual Accredited Investors [Member]
Dec. 31, 2006
Maximum [Member]
Preferred Stock, Shares Authorized   10,000,000 10,000,000 10,000,000                   10,000,000                   2,200 2,200                            
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)   $ 0.01 $ 0.01 $ 0.01                   $ 0.01                                                  
(in Dollars per share)                                               $ 1,000 $ 1,000   $ 0                        
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars)   $ 1,999,032 $ 1,999,032                     $ 2,727,475                     $ 2,200,000                            
Proceeds from Issuance of Convertible Preferred Stock (in Dollars)                                                 2,000,000                            
Convertible Preferred Stock, Conversion Price Per Share (in Dollars per share)                                                   $ 0.75                          
Convertible Preferred Stock, Total Conversion Shares                                               1,050,667 1,050,667 2,933,333                          
Number of Preferred Shares Converted into Common Stock                                               1,412                              
Stock Issued During Period, Shares, Conversion of Convertible Securities                                               1,882,667                              
Preferred Stock, Shares Outstanding                                               788 788   0                        
Class of Warrant or Right, Percentage of Conversion Shares Could Be Purchased                                               100.00% 100.00%                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)                                     2,933,333   2,933,333   2,933,333 8,799,999 8,799,999                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)                                     1.00   0.75 0.60 1.00                                
Stock Issued During Period, Shares, New Issues (in Shares) 12,000                                                                       407,999 658,520  
Other Accrued Liabilities, Current (in Dollars)           90,000                                                                  
Stock Issued During Period, Value, New Issues (in Dollars)     273,360 441,210 90,000 1,520,000 1,771,091 3,162,950     239,919 2,459,609 470                                               273,360 441,210  
Proceeds from Issuance of Common Stock (in Dollars)     310,160 404,410         500,000 1,500,000 750,000     15,836,468                                             36,800    
(in Dollars)                                     2,933,333 [1]   2,933,333 [1]   2,933,333 [1]                             987,783  
Warrants Issued During Period, Exercise Price (in Dollars per share)                                                                         $ 1.00 $ 1.00  
Number of Warrants Issued During Period                                                                         612,001    
Stock Issued During Period, Shares, Issued for Services     0 129,245 10,500                                                                    
Allocated Share-based Compensation Expense (in Dollars)     310,076 463,752 575,662                                             0 150,000 53,813 0 7,119 121,057 231,936 284,352 369,161      
Minimum Option Exercise Price as Percentage of Fair Value of ISO's Granted to Certain Employees                 110.00%                                                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     6 years 255 days 7 years 6 years 255 days                                                                   10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                                   3 years                                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 1,200,000                                                            
Share-based Compensation (in Dollars)     310,076 772,997 750,532                 6,669,815 310,076 463,752 575,662                                            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)   271,901 271,901                     271,901                                                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 36 days                                                                        
Other General and Administrative Expense (in Dollars)       $ 152,126                               $ 218,551                                      
[1] See discussion under "Series A Convertible Preferred Stock" above.