Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Stock Warrants (Details Textual)

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Note 14 - Stock Warrants (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
Jan. 31, 2017
Mar. 31, 2017
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   $ 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   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 1,000,000
Class of Warrant or Right, Grants in Period, Estimated Fair Value     $ 334,000 $ 334,000
Warrants to Purchase Navidea Common Stock [Member]        
Class of Warrant or Right, Outstanding       16,900,000
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       $ 3.04
Class of Warrant or Right, Outstanding Term       18 years
Warrants to Purchase Navidea Common Stock [Member] | Weighted Average [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 1.19
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