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Note 5 - Stockholders' Equity (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 138 Months Ended 147 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended
May 31, 2013
Jan. 31, 2013
Feb. 28, 2010
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 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
Sep. 30, 2013
Aug. 01, 2013
Jun. 10, 2013
Sep. 30, 2013
Employee Stock Option [Member]
Sep. 30, 2012
Employee Stock Option [Member]
Sep. 30, 2013
Employee Stock Option [Member]
Sep. 30, 2012
Employee Stock Option [Member]
Dec. 31, 2012
Employee Stock Option [Member]
Dec. 31, 2011
Employee Stock Option [Member]
Dec. 31, 2010
Employee Stock Option [Member]
Dec. 31, 2006
Employee Stock Option [Member]
May 14, 2013
Series B Warrants [Member]
Jan. 17, 2013
Series B Warrants [Member]
May 31, 2013
Series B Warrants [Member]
Jan. 31, 2013
Series B Warrants [Member]
Dec. 31, 2012
Series B Warrants [Member]
May 13, 2013
Series B Warrants [Member]
Jan. 16, 2013
Series B Warrants [Member]
Dec. 31, 2012
Series A Warrants [Member]
Dec. 31, 2012
Series C Warrants [Member]
Jan. 31, 2012
Individual Accredited Investors [Member]
Dec. 31, 2011
Individual Accredited Investors [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]
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]
Dec. 31, 2012
Series A Convertible Preferred Stock [Member]
Sep. 30, 2013
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, 2006
Maximum [Member]
Note 5 - Stockholders' Equity (Details) [Line Items]                                                                                                                  
Common Stock, Shares Authorized (in Shares)           75,000,000 40,000,000   40,000,000 40,000,000                   40,000,000 75,000,000 75,000,000 40,000,000                                                                    
Common Stock, Shares, Outstanding (in Shares)           21,666,610 18,733,277   18,733,277 16,442,611                   18,733,277 21,666,610                                                                        
Stock Issued During Period, Shares, New Issues (in Shares) 1,166,666 1,766,667 12,000                                                                           407,999 658,520                              
Proceeds from Warrant Exercises (in Dollars)                                                               $ 583,333 $ 1,060,000 $ 583,333 $ 1,060,000                                            
Share-based Compensation           116,600   247,318 310,076 772,997 750,532                 6,669,815 6,634,289     33,348 84,742 116,600 247,318 310,076 463,752 575,662                                                      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized             271,901   271,901                     271,901       135,418   135,418                                                              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                 2 years 36 days                                 1 year 255 days                                                              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)                                                               0.50 0.60     0.75 0.60 0.75 1.00 1.00                                  
Class of Warrant or Right, Exercises (in Shares)           (2,933,333)     0                                             1,166,666 1,766,667   1,766,667                                            
Class of Warrant or Right, Outstanding (in Shares)           8,292,226 11,225,559   11,225,559 1,870,559                   11,225,559 8,292,226                       1,166,667                                                
Other General and Administrative Expense (in Dollars)       19,617 218,551 238,169       152,126                     390,295                           218,551                                            
Preferred Stock, Shares Authorized (in Shares)           10,000,000 10,000,000   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                   $ 0.01 $ 0.01                                                                        
(in Dollars per share)                                                                                                       $ 1,000 $ 1,000 $ 1,000   $ 1,000  
Proceeds from Issuance of Preferred Stock and Preference Stock             1,999,032 1,999,032 1,999,032                     2,727,475 2,727,475                                                               2,200,000        
Proceeds from Issuance of Convertible Preferred Stock                                                                                                         2,000,000        
Convertible Preferred Stock, Conversion Price Per Share (in Dollars per share)                                                                                                             $ 0.75    
Convertible Preferred Stock, Total Conversion Shares (in Shares)                                                                                                       1,050,667 1,050,667   2,933,333    
Number of Preferred Shares Converted into Common Stock (in Shares)                                                                                                       1,412          
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares)                                                                                                       1,882,667          
Preferred Stock, Shares Outstanding (in Shares)                                                                                                       788 788 788   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                         8,799,999 8,799,999        
Other Accrued Liabilities, Current                       90,000                                                                                          
Stock Issued During Period, Value, New Issues                 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           1,643,333   310,160 310,160 404,410         500,000 1,500,000 750,000     15,836,468 17,479,801                                       36,800                                
                                                                      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 (in Shares)                                                                                 612,001                                
Stock Issued During Period, Shares, Issued for Services (in Shares)                 0 129,245 10,500                                                                                            
Allocated Share-based Compensation Expense                 $ 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 (in Shares)                             1,200,000                                                                                    
[1] See discussion under "Series A Convertible Preferred Stock" above.