Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Stock Warrants (Details Textual)

v3.10.0.1
Note 13 - Stock Warrants (Details Textual) - USD ($)
 1 Months Ended 9 Months Ended
Mar. 31, 2017
Jan. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Series NN Warrants [Member]        
Class of Warrant or Right, Term 5 years      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.50      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 77.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.00%      
Series NN Warrants [Member] | Cardinal Health 414 [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 10,000,000      
Class of Warrant or Right, Grants in Period, Estimated Fair Value       $ 3,300,000
Series NN Warrants [Member] | UCSD [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,000,000     1,000,000
Class of Warrant or Right, Grants in Period, Estimated Fair Value       $ 334,000
Warrants to Purchase Navidea Common Stock [Member]        
Class of Warrant or Right, Outstanding     16,400,000  
Warrants to Purchase Navidea Common Stock [Member] | Minimum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.01  
Class of Warrant or Right, Outstanding Term     1 year  
Warrants to Purchase Navidea Common Stock [Member] | Maximum [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 2.50  
Class of Warrant or Right, Outstanding Term     17 years  
Warrants to Purchase Navidea Common Stock [Member] | Weighted Average [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 1.15  
Warrants to Purchase MT Common Stock [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 2,000  
Class of Warrant or Right, Outstanding     300  
Chief Executive Officer [Member]        
Class of Warrant or Right, Exercises in Period   5,411,850    
Stock Issued During Period, Shares, Issued for Exercise of Warrants   5,411,850    
Proceeds from Warrant Exercises   $ 54,119