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Note 7 - Stockholders' Equity (Deficit) (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2016
$ / shares
shares
Apr. 15, 2016
$ / shares
shares
Feb. 12, 2016
USD ($)
$ / shares
shares
Apr. 01, 2012
shares
Sep. 30, 2016
$ / shares
shares
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Jul. 27, 2016
$ / shares
shares
Jun. 26, 2016
$ / shares
shares
Oct. 02, 2015
$ / shares
shares
Oct. 01, 2015
shares
Dec. 31, 2013
shares
Mar. 15, 2006
shares
Stock Conversion from Series B Preferred Stock to Common Stock [Member]                              
Convertible Preferred Stock, Shares Issued upon Conversion 1                            
Former Executives [Member] | Employee Stock Option [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             3 years                
Former Executives [Member]                              
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                
Chief Financial Officer [Member] | Employee Stock Option [Member] | The 2006 Plan [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 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 | $           $ 5,192 $ 10,383                
Chief Financial Officer [Member] | The 2006 Plan [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                        
Each Member of Board of Directors [Member] | Employee Stock Option [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   2 years                          
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] | Employee Stock Option [Member] | Minimum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years                          
Employees and Consultants [Member] | Employee Stock Option [Member] | Maximum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year                          
Employees and Consultants [Member] | Employee Stock Option [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years                          
Employees and Consultants [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,008,299                          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares   $ 1.25                          
Employee Stock Option [Member] | The 2006 Plan [Member] | Minimum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year     1 year 180 days              
Employee Stock Option [Member] | The 2006 Plan [Member] | Maximum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years       5 years              
Employee Stock Option [Member] | The 2006 Plan [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years 10 years              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       2,000,000 2,000,000   2,000,000               140,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             5 years                
Employee Stock Option [Member]                              
Allocated Share-based Compensation Expense | $               $ 190,751 $ 85,168            
Reverse Stock Split [Member] | Series B Preferred Stock [Member]                              
Stockholders' Equity Note, Stock Split, Conversion Ratio     15,463.7183                        
Reverse Stock Split [Member]                              
Stockholders' Equity Note, Stock Split, Conversion Ratio 15,463.7183                            
The 2006 Plan [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         2,592,229   2,592,229 292,256 782,256            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               490,000 240,000            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares               $ 1.25 $ 1            
Protagenic Therapeutics Inc [Member] | Private Placement [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     3,403,367                        
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                        
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]                              
Business Combination, Stock Warrant Conversion Ratio     1                        
Debt Instrument, Face Amount | $     $ 665,000                        
Debt Instrument, Increase, Accrued Interest | $     $ 35,000                        
Class of Warrant or Right, Expiration Period     5 years                        
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                          
Private Placement [Member] | Placement Agent Warrants [Member]                              
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, Expiration Period     5 years                        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 1.25                        
Predecessor Warrants [Member] | Series B Preferred Stock [Member]                              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     295,945                        
Series B Preferred Stock [Member]                              
Preferred Stock, Shares Authorized         18,000,000   18,000,000 18,000,000              
Common Stock, Shares Authorized 100,000,000       100,000,000   100,000,000 20,000,000 20,000,000 100,000,000 100,000,000,000 20,000,000 10,000,000    
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001 $ 0.0001 $ 0.001 $ 0.0001 $ 0.000001 $ 0.001      
Preferred Stock, Shares Authorized 20,000,000       20,000,000   20,000,000 20,000,000   20,000,000 5,000,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         2,592,229   2,592,229 1,707,744 1,217,744         977,744  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             1,974,445 490,000 240,000            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares             $ 1.25 $ 1.25 $ 1            
Allocated Share-based Compensation Expense | $             $ 450,566                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares             133,229                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares               $ 1