Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Commitments and Contingencies (Details Textual)

v3.19.1
Note 11 - Commitments and Contingencies (Details Textual)
1 Months Ended 3 Months Ended
Apr. 18, 2019
$ / shares
Mar. 07, 2019
shares
Aug. 16, 2018
Aug. 14, 2018
Apr. 09, 2018
USD ($)
Mar. 31, 2017
USD ($)
Nov. 30, 2018
shares
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Aug. 31, 2018
shares
Jun. 30, 2018
USD ($)
Stockholders' Equity Attributable to Parent, Ending Balance                   $ (573,674) $ 1,742,139   $ 2,100,000
Common Stock, Par or Stated Value Per Share | $ / shares                   $ 0.001 $ 0.001    
Subsequent Event [Member]                          
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.001                        
Previously Reported [Member]                          
Stockholders' Equity Attributable to Parent, Ending Balance                     $ 1.70    
Common Stock [Member]                          
Stock Issued During Period, Shares, New Issues | shares                   17,857      
Former Chief Executive Officer and President [Member]                          
Common Stock Shares Provided by Agreement | shares                       1,175,000  
Common Stock Shares Provided by Agreement, Escrow Period       1 year 180 days                  
Former Chief Executive Officer and President [Member] | Common Stock [Member]                          
Stock Issued During Period, Shares, New Issues | shares             925,000            
Stock Issued During Period, Shares, New Issues Placed in Escrow | shares             250,000            
Former Chief Executive Officer and President [Member] | MT [Member] | Common Stock [Member] | Forecast [Member] | Dr. Michael Goldberg [Member]                          
Ownership Percentage                   5.00%      
CRG Loan Agreement, Texas Case [Member] | Judicial Ruling [Member]                          
Loss Contingency, Damages Awarded, Value, Additional Amount               $ 7,000,000          
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration               4,100,000   $ 4,100,000      
CRG Loan Agreement, Texas Case [Member] | Pending Litigation [Member]                          
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration                   $ 4,100,000      
Platinum-Montaur Life Sciences LLC Litigation [Member] | Pending Litigation [Member]                          
Loss Contingency, Damages Sought, Value                 $ 1,900,000        
Complaint By Dr. Goldberg Against Navidea and MT [Member]                          
Litigation Case, Number of Shares of Common Stock Failed to Issue | shares   1,175,000                      
Complaint By Dr. Goldberg Against Navidea and MT [Member] | MT [Member]                          
Litigation Case, Number of Shares of Common Stock Failed to Issue | shares   1,175,000                      
Maximum [Member] | Subsequent Event [Member]                          
Stockholders' Equity Note, Stock Split, Conversion Ratio 20                        
Minimum [Member]                          
Stockholders' Equity Note, Stock Split, Conversion Ratio     5                    
Term Loan Agreement [Member] | CRG Loan Agreement, Texas Case [Member] | Judicial Ruling [Member]                          
Repayments of Debt         $ 7,100,000 $ 59,000,000              
CRG [Member] | Term Loan Agreement [Member] | CRG Loan Agreement, Texas Case [Member] | Judicial Ruling [Member]                          
Repayments of Debt               59,000,000          
CRG [Member] | Term Loan Agreement [Member] | Maximum [Member]                          
Debt Instrument, Agreed-upon Final Payoff Amount               $ 66,000,000