Note 6 - Stockholders' Deficiency and Additional Paid-in Capital (Details Textual) | Nov. 10, 2015shares | Aug. 14, 2015USD ($)$ / sharesshares | Aug. 13, 2015USD ($)$ / sharesshares | Jul. 30, 2015USD ($)$ / sharesshares | Apr. 22, 2015shares | Jul. 25, 2014$ / sharesshares | Apr. 24, 2014shares | Apr. 10, 2014shares | Mar. 19, 2014shares | Jun. 19, 2013shares | Sep. 30, 2015$ / sharesshares | Jun. 30, 2015shares | Sep. 30, 2015USD ($)$ / sharesshares | Sep. 30, 2014USD ($) | Dec. 31, 2014$ / sharesshares | May. 01, 2014shares |
Stock Option Plan 1999 [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | | | | | | | | | | | 0 | | 0 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | | | | | | 36,000 | | | | | | | | | | |
VBI US Stock Option Plan 2006 [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | | | | | | | | | | | 2,624,368 | 2,624,368 | 2,624,368 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | | | | | | | | | 100,541 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | | | | | | 2,724,909 | | 2,724,909 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | | | | | | | | | | | | | 100,541 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | 1,844,592 | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | | | | | | | | | | 4 years | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | | | | | | | | | | | | | 0.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | | | | | | | | | | 1.81% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | | | | | | | | | | 87.77% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | | | | | | | | | | 5 years 273 days | | | |
Stock Option Plan 1999, VBI US Stock Option Plan 2006, Stock Incentive Plan 2013 [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | | | | | | | | | | | 0 | | 0 | | | |
Stock Incentive Plan 2013 [Member] | Common Stock [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | | | | | | 36,000 | 204,000 | | | | | | | |
Stock Incentive Plan 2013 [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | | | | | | | | | | | 8,871 | | 8,871 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | | | | | | | | | | | | | 51,129 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | | | | | 300,000 | 300,000 | | 300,000 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | | | | | | | | | | | | | 240,000 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | 60,000 | | | | | | |
Equity Incentive Plan 2014 [Member] | Increase Event [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | | | | | | | | | | | | | 1,200,000 | | | |
Equity Incentive Plan 2014 [Member] | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | | | | | | | | | | | 1,412,000 | | 1,412,000 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | | | | | | | | | | | 384,325 | | 384,325 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | | | | | | 1,816,326 | | 1,816,326 | | | 815,688 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | | | | | | | | | | | | | 20,001 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | | 1,203,000 | 45,000 | | | 164,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | | | | | | | | | | | | | 0.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | | | | | | | | | | 1.68% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | | | | | | | | | | 84.72% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | | | | | | | | | | 6 years 91 days | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | | | | | 1,000,638 | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award Percent of Additional Shares Authorized | | | | | | | | | | | | | 5.00% | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | | | | | | | | | | | | | | | 20,001 | |
Series 1 Convertible Preferred Stock [Member] | Subsequent Event [Member] | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 500,000 | | | | | | | | | | | | | | | |
Conversion of Stock, Shares Converted | 500,000 | | | | | | | | | | | | | | | |
Series 1 Convertible Preferred Stock [Member] | | | | | | | | | | | | | | | | |
Convertible preferred stock, shares authorized (in shares) | | | | | | | | | | | 30,000,000 | | 30,000,000 | | | |
General and Administrative Expense [Member] | | | | | | | | | | | | | | | | |
Consulting Services Expense | $ | | | | $ 44,800 | | | | | | | | | | | | |
Private Placement [Member] | | | | | | | | | | | | | | | | |
Securities Purchase Agreement, Number of Investors | | | 19 | | | | | | | | | | | | | |
Common stock, shares issued (in shares) | | | 3,000,000 | | | | | | | | | | | | | |
Shares Issued, Price per Share, Percentage of Volume Weighted Average Common Stock Price Reported by Bloomberg LP | | | 85.00% | | | | | | | | | | | | | |
Number of Trading Days Prior to Each Closing | | | 10 days | | | | | | | | | | | | | |
Proceeds from Issuance of Common Stock | $ | | $ 6,285,700 | $ 6,285,700 | | | | | | | | | | | | | |
Private Placement, First Closing [Member] | | | | | | | | | | | | | | | | |
Shares Issued, Price Per Share | $ / shares | | | $ 2.10 | | | | | | | | | | | | | |
Common stock, shares issued (in shares) | | | 2,285,000 | | | | | | | | | | | | | |
Proceeds from Issuance of Common Stock | $ | | | $ 4,798,500 | | | | | | | | | | | | | |
Private Placement, Final Closing [Member] | | | | | | | | | | | | | | | | |
Shares Issued, Price Per Share | $ / shares | | $ 2.08 | | | | | | | | | | | | | | |
Common stock, shares issued (in shares) | | 715,000 | | | | | | | | | | | | | | |
Proceeds from Issuance of Common Stock | $ | | $ 1,487,200 | | | | | | | | | | | | | | |
Common Stock [Member] | Certain Operational Milestone [Member] | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | | | | | | | | 699,281 | | 699,281 | | | |
Common Stock [Member] | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | | | 699,281 | | | | | | | | | | |
Warrant [Member] | Certain Operational Milestone [Member] | | | | | | | | | | | | | | | | |
Proceeds from Other Equity | $ | | | | | | | | | | | | | $ 3,000,000 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | | | | | | | | | | | 4,045,239 | | 4,045,239 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | | | | | | | | | | | 384,325 | | 384,325 | | | |
Common stock, shares authorized (in shares) | | | | | | | | | | | 200,000,000 | | 200,000,000 | | 200,000,000 | |
Common stock, par value (in dollars per share) | $ / shares | | | | | | | | | | | $ 0.0001 | | $ 0.0001 | | $ 0.0001 | |
Convertible preferred stock, shares authorized (in shares) | | | | | | | | | | | 30,000,000 | | 30,000,000 | | 30,000,000 | |
Stock Issued During Period, Shares, Issued for Services | | | | 17,500 | | | | | | | | | | | | |
Shares Issued, Price Per Share | $ / shares | | | | $ 2.56 | | | | | | | | | | | | |
Common stock, shares issued (in shares) | | | | | | | | | | | 23,030,260 | | 23,030,260 | | 20,012,760 | |
Proceeds from Issuance of Common Stock | $ | | | | | | | | | | | | | $ 6,285,700 | $ 15,214,561 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | | | | | | | | | | | | | 51,129 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | | | | | | 4,841,235 | | 4,841,235 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | | | | | | | | | | | | | 360,542 | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | | | $ 2.145 | | | | | | | | | | |