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Note 6 - Stockholders' Equity (Details Textual)				3 Months Ended		9 Months Ended
	Jun. 17, 2017	Jan. 01, 2017 shares	Feb. 12, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number				2,613,299		2,613,299		2,484,445
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $				$ 181,537		$ 181,537		$ 171,537
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						150,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares						$ 1.25
Class of Warrant or Right, Outstanding				3,826,658		3,826,658			3,826,658
Class of Warrant or Right, Outstanding, Weighted Average Exercise Price | $ / shares				$ 1.05		$ 1.05			$ 1.02
Class of Warrant or Right Outstanding, Aggregate Intrinsic Value | $				$ 763,342		$ 763,342
Fair Value Adjustment of Warrants | $						$ 99,782
Warrants with Extended Term [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				100,000		100,000
Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			423,291
Private Placement [Member] | General and Administrative Expense [Member]
Fair Value Adjustment of Warrants | $						$ 99,782
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
Employee Stock Option [Member]
Allocated Share-based Compensation Expense | $				$ 153,830	$ 273,674	654,707	$ 450,566
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $				$ 880,075		$ 880,075
The 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		564,378
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		2,712,678
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						150,000	1,201,084
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares						$ 1.25
The 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						0	100,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares						$ 1.25

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