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Note 9 - Stockholder's Equity (Details Textual) |  |  |  |  |  |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2015 $ / shares | Dec. 02, 2014 USD ($) shares | Oct. 21, 2014 USD ($) $ / shares shares | Jul. 10, 2014 USD ($) $ / shares shares | Jun. 13, 2014 $ / shares shares | May. 21, 2014 USD ($) $ / shares shares | May. 06, 2014 $ / shares shares | Apr. 29, 2014 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares | Apr. 29, 2015 | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Sep. 30, 2015 $ / shares | Dec. 31, 2013 shares | Dec. 31, 2012 shares
Notes Payable Dated July 9, 2012 Issued to Investor One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 7,764 |  |  |  |  |  |  |  |  |  |  |  |  |
Note Payable to High Yield Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  |  |  | 259,236 |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Notes payable Dated July 9, 2012 Issued to Investor Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 7,764 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable to 11 Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of Investors Converting Debt |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Director Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  | 0 | 438,131 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 3.70 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  | 6,650 | 2,849,050 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.90 | $ 3.70 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Investors [Member] | Warrants to Purchase Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  | 4 years | 4 years | 4 years | 4 years | 4 years |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 15,000 | 533,625 | 261,693 | 1,025,438 | 832,950 |  |  |  |  |  |  |
Number of Shares of Common Stock Consisted in Unit |  |  |  | 1 | 1 | 1 | 1 | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  |  | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  | $ 4 | $ 4 | $ 4 | $ 4 | $ 4 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 4.80 | $ 4.80 | $ 4.80 | $ 4.80 | $ 4.80 |  |  |  |  |  |  |
Placement Agent [Member] | Warrants to Purchase Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 5,000 | 177,875 | 89,731 | 341,813 | 277,650 |  |  |  |  |  |  |
Placement Agent [Member] | Common Stock Warrants Issued April 29, 2014 [Member] | Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 35,000 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  | $ 4.80 |  |  |  |  |  |  |
A Law Firm [Member] | Warrants to Purchase Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 24,393 |  |  |
Independent Consultant [Member] | Warrants to Purchase Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  | $ 4.90 |  |  | $ 4.90 |  |  |
Warrant Expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 25,976 |  |  |
Class of Warrant or Right Vesting Period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Adjustments to Additional Paid in Capital, Change in Fair Value of Warrants Issued | $ |  |  |  |  |  |  |  |  |  |  | $ (516) |  |  |  |
Investor Relations Firm [Member] | Common Stock Warrants [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Expense | $ |  |  |  |  |  |  |  |  |  |  | 496,010 | $ 21,566 |  |  |
Investor Relations Firm [Member] | Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Term |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  | $ 3.75 |  |  | $ 3.75 |  |  |
Term of Agreement with Counterparty |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  |  |  |  |  | $ 517,576 |  |  |  |
Warrants to Purchase Common Stock [Member] | Convertible Notes Payable [Member] | Board of Directors Chairman [Member] | Financing Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 351,060 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  | $ 2 |  |  |  |  |  |  |
Warrants to Purchase Common Stock [Member] | Financing Transaction [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 107,395 |  |  |
Convertible Notes Payable [Member] | Board of Directors Chairman [Member] | Financing Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued to Chairman in Connection with Settlement of Outstanding Debt |  |  |  |  |  |  |  | 546,553 |  |  |  |  |  |  |
Number of Convertible Promissory Notes Converted |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ |  |  |  |  |  |  |  | $ 1,050,000 |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Related Party Debt | $ |  |  |  |  |  |  |  | $ (1,650,378) |  |  |  |  |  |  |
Convertible Notes Payable [Member] | Financing Transaction [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  | 100,000 |  |  |  |  |  |  |  |  | 100,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 4.80 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ |  |  | $ 200,000 |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
Gains (Losses) on Extinguishment of Related Party Debt | $ |  |  | $ (257,394) |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  | 18,614,968 |  | 18,614,968 | 18,614,968 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  | 6,650 | 3,287,181 |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  | 1,000,000,000 |  | 1,000,000,000 | 1,000,000,000 |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  |  |  |  | 18,614,968 |  | 18,614,968 | 18,614,968 |  |  | 890,837
Stock Issued During Period, Shares, New Issues |  |  |  | 50,000 | 1,778,750 | 872,310 | 3,418,125 | 2,776,500 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  | 4,781,574 |  |  |  |
Share Price | $ / shares | $ 2.80 |  |  |  |  |  |  |  |  |  | $ 1 |  | $ 0.90 |  |
Proceeds from Issuance of Private Placement | $ |  |  |  | $ 35,600,000 |  |  |  |  |  |  |  |  |  |  |
Net Proceeds from Issuance of Private Placement | $ |  |  |  | 31,900,000 |  |  |  |  |  |  |  |  |  |  |
Payments of Placement Agent Fees in Private Placement | $ |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |
Payments of Estimated Offering Expenses in Private Placement | $ |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Number of Shares of Common Stock for Which Registration Statement is Filed for Offering and Resale of Common Stock |  |  |  | 11,633,885 |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Related Party Debt | $ |  |  |  |  |  |  |  |  |  |  |  | $ (1,907,772) |  |  |
Gain (Loss) on Settlement of Notes Payable | $ |  | $ (400,016) |  |  |  |  |  |  |  |  |  | $ (400,016) |  |  |
Stock Issued During Period, Shares, Issued to Creditors in Connection with Settlement of Debt |  |  |  |  |  |  |  |  |  |  |  | 160,056 |  |  |
Stock Issued During Period, Shares, Issued to Law Firm in Connection with Conversion of Outstanding Debt |  |  |  |  |  |  |  |  |  |  |  | 53,457 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  |  |  | 3,648,247 |  | 3,011,498 | 3,648,247 |  | 389,436 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  |  |  |  |  |  | 1,072,111 |  | 1,861,952 | 1,072,111 |  | 367,110 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.90 | $ 3.71 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 1 year |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |
Adjustments to Additional Paid in Capital, Change in Fair Value of Warrants Issued | $ |  |  |  |  |  |  |  |  |  |  | $ (516) |  |  |  |

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from the increase (decrease) in the fair value of warrants issued. + References No definition available. + Details
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