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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.

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