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Note 3 - Summary of Significant Accounting Policies - Allocation of Consideration Transferred (Details) (Parentheticals) - shares	Jul. 27, 2016	Feb. 12, 2016
Stock Issued During Period, Shares, Reverse Stock Split, Post-split	25,867
Protagenic Therapeutics Inc [Member]
Stock Issued During Period, Shares, Conversion of Series A Preferred Stock to Series B Preferred Stock		297,468
Common Stock [Member] \| Protagenic Therapeutics Inc [Member]
Stock Issued During Period, Shares, Reverse Stock Split, Post-split		25,867
Preferred Stock [Member] \| Protagenic Therapeutics Inc [Member] \| Series B Preferred Stock [Member]
Stock Issued During Period, Shares, Conversion of Series A Preferred Stock to Series B Preferred Stock		297,468