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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.

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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