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Note 7 - Stockholders' Equity (Deficit) (Details Textual)
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Oct. 26, 2016
$ / shares
shares
Apr. 15, 2016
$ / shares
shares
Feb. 12, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
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 $ 1.04       $ 1.04  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ $ 697,820       $ 697,820  
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 $ 1.07       $ 1.07 $ 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         1,193,300  
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