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Note 4 - Liquidity and Management Plans (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
May 05, 2016
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Sun BioPharma Australia Pty Ltd. [Member]        
Proceeds from Income Tax Refunds $ 772,000      
Private Placement [Member] | Purchase Agreements [Member]        
Proceeds from Issuance of Private Placement     $ 1,755,000  
Private Placement [Member]        
Proceeds from Issuance of Private Placement   $ 1,755,000    
Proceeds from Issuance of Private Placement     $ 1,603,000