Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Commitments and Contingencies (Details Textual)

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