Note 7 - Stockholders' Equity (Deficit) (Details Textual) | Dec. 31, 2016USD ($)$ / sharesshares | Oct. 26, 2016$ / sharesshares | Apr. 15, 2016$ / sharesshares | Feb. 12, 2016USD ($)$ / sharesshares | Dec. 31, 2016USD ($)$ / sharesshares | Dec. 31, 2015USD ($)$ / sharesshares |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 2,484,445 | | | | 2,484,445 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares | $ 1.18 | | | | $ 1.18 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ | $ 171,537 | | | | $ 171,537 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | 1,308,300 | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | | | $ 1.25 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | | | | | 1,272,982 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | 25,000 | |
Stock Issued During Period, Value, Stock Options Exercised | $ | | | | | $ 6,500 | |
Class of Warrant or Right, Outstanding | 3,826,658 | | | | 3,826,658 | 3,403,367 |
Class of Warrant or Right, Outstanding, Weighted Average Exercise Price | $ / shares | $ 1.05 | | | | $ 1.05 | $ 1.03 |
Class of Warrant or Right Outstanding, Aggregate Intrinsic Value | $ | $ 763,342 | | | | $ 763,342 | |
Predecessor Warrants [Member] | Series B Preferred Stock [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | 295,945 | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | $ 1.25 | | |
Private Placement [Member] | Series B Preferred Stock [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | 423,291 | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | $ 1.25 | | |
Class of Warrant or Right, Expiration Period | | | | 5 years | | |
Private Placement [Member] | Placement Agent Warrants [Member] | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | $ 1.25 | | | |
Private Placement [Member] | Placement Agent Warrants [Member] | Series B Preferred Stock [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | 127,346 | | | |
Protagenic Therapeutics Inc [Member] | | | | | | |
Business Combination, Stock Warrant Conversion Ratio | | | | 1 | | |
Debt Instrument, Face Amount | $ | | | | $ 665,000 | | |
Debt Instrument, Increase, Accrued Interest | $ | | | | $ 35,000 | | |
Protagenic Therapeutics Inc [Member] | Predecessor Warrants [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | 295,945 | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | $ 1.25 | | |
Class of Warrant or Right, Expiration Period | | | | 5 years | | |
Protagenic Therapeutics Inc [Member] | Placement Agent Warrants [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | 127,346 | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | $ 1.25 | | |
Protagenic Therapeutics Inc [Member] | Private Placement [Member] | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | | | | 3,403,367 | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | $ 1.05 | | |
Each Member of Board of Directors [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 40,000 | | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | $ 1.25 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Additional | | | 5,000 | | | |
Director [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 175,000 | | | |
Employees and Consultants [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 1,009,300 | | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | $ 1.25 | | | |
Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ | 1,261,625 | | | | | |
Former Executives [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | | | 3 years | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | 17,785 | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | | | $ 1.25 | |
Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ | $ 22,231 | | | | | |
Employee [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | 4 years | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | 10 years | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | 25,000 | | | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | $ 1.25 | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vesting Period | | 1 year | | | | |
Employee Stock Option [Member] | | | | | | |
Allocated Share-based Compensation Expense | $ | | | | | $ 546,134 | $ 477,868 |
Employee Stock Option [Member] | Each Member of Board of Directors [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | 2 years | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | 10 years | | | |
Employee Stock Option [Member] | Employees and Consultants [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | 4 years | | | |
Employee Stock Option [Member] | Minimum [Member] | Employees and Consultants [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | 10 years | | | |
Employee Stock Option [Member] | Maximum [Member] | Employees and Consultants [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | 1 year | | | |
The 2006 Plan [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 2,484,445 | | | | 2,484,445 | 1,707,744 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares | $ 1.18 | | | | $ 1.18 | $ 0.84 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | 1,308,300 | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | | | $ 1.25 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | 25,000 | |
The 2006 Plan [Member] | Chief Financial Officer [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | 100,000 | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | | $ 1.25 | | |
The 2006 Plan [Member] | Employee Stock Option [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 2,000,000 | | | | 2,000,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | | | 10 years | |
The 2006 Plan [Member] | Employee Stock Option [Member] | Chief Financial Officer [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | 3 years | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | | 10 years | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting, Number of Monthly Installments | | | | 35 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting, Monthly Installment, Shares | | | | 0.18 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting, Final Monthly Installment, Shares | | | | 2,778 | | |
Allocated Share-based Compensation Expense | $ | | | | | $ 25,696 | |
The 2006 Plan [Member] | Employee Stock Option [Member] | Minimum [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | | 1 year | |
The 2006 Plan [Member] | Employee Stock Option [Member] | Maximum [Member] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | | 5 years | |