Annual report pursuant to Section 13 and 15(d)

Note 15 - Commitments and Contingencies (Details Textual)

Note 15 - Commitments and Contingencies (Details Textual)														1 Months Ended		6 Months Ended	12 Months Ended	17 Months Ended
	Mar. 07, 2019 shares	Nov. 20, 2018 shares	Aug. 14, 2018 USD ($) shares	Apr. 12, 2018 USD ($)	Apr. 09, 2018 USD ($)	Mar. 26, 2018 USD ($)	Jan. 16, 2018 USD ($)	Nov. 02, 2017 USD ($)	May 12, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 03, 2017 USD ($) $ / shares	Oct. 11, 2016 USD ($)	Jun. 22, 2016 USD ($)	Nov. 30, 2018 shares	Dec. 31, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2019	Jun. 30, 2018 USD ($)	Mar. 07, 2017 USD ($)	May 31, 2015
Stockholders' Equity Attributable to Parent, Ending Balance															$ 11,379,630		$ 1,742,139		$ 2,100,000
Common Stock, Par or Stated Value Per Share \| $ / shares											$ 0.001				$ 0.001		$ 0.001
Common Stock [Member]
Stock Issued During Period, Shares, New Issues \| shares																	18,320,610
Former Chief Executive Officer and President [Member]
Severance Costs, Payable			$ 978,000
Severance Costs , Payable Period			2 years
Severance Costs, Payable for Continuation of Healthcare Coverage			$ 35,000
Severance Costs, Payable, Period for Healthcare Coverage			1 year 120 days
Common Stock Shares Provided by Agreement \| shares			23,500,000
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		18,500,000												18,500,000
Stock Issued During Period, Shares, New Issues Placed in Escrow \| shares		5,000,000												5,000,000			5,000,000
CRG [Member]
Draws on Letter of Credit					$ 7,100,000
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value, Additional Amount											$ 7,000,000				$ 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] \| Judicial Ruling [Member] \| Surety Bond [Member]
Loss Contingency, Amount Awarded to Other Party						$ 7,700,000
CRG Loan Agreement, Texas Case [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration							$ 4,100,000
Loss Contingency, Damages Awarded,Value, Requested Modified Amount							$ 2,900,000
CRG Loan Agreement, Ohio Case [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Sought, Value				$ 4,100,000
Former CEO Arbitration [Member]
Litigation Settlement, Salary, Bonus, and Benefits, Amount Awarded to Other Party									$ 481,039
Litigation Settlement, Amount Awarded to Other Party									$ 617,880
FTI Consulting, Inc. Litigation [Member] \| Pending Litigation [Member] \| Investigative and Consulting Services [Member]
Loss Contingency, Damages Sought, Value												$ 730,264				$ 862,165
Litigation Settlement, Amount Awarded to Other Party																$ 435,000
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] \| MT [Member] \| Subsequent Event [Member]
Litigation Case, Number of Shares of Super Voting Common Stock Failed to Issue \| shares	23,500,000
Dr. Michael Goldberg [Member] \| Former Chief Executive Officer and President [Member] \| MT [Member] \| Common Stock [Member] \| Scenario, Forecast [Member]
Ownership Percentage																		5.00%
Minimum [Member] \| Scenario, Forecast [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio																		5
Minimum [Member] \| FTI Consulting, Inc. Litigation [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Sought, Value												782,600
Minimum [Member] \| FTI Consulting, Inc. Litigation [Member] \| Pending Litigation [Member] \| Purported Interest Due on Unpaid Invoices, Plus Attorneys' Fees, Costs and Expenses [Member]
Loss Contingency, Damages Sought, Value												$ 52,337
Maximum [Member] \| Scenario, Forecast [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio																		20
Maximum [Member] \| CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value											66,000,000				66,000,000
Term Loan Agreement [Member] \| CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Repayments of Debt					$ 7,100,000					$ 59,000,000
Term Loan Agreement [Member] \| Cardinal Health 414 [Member]
Letters of Credit Outstanding, Amount											7,000,000
Term Loan Agreement [Member] \| CRG [Member]
Letters of Credit Outstanding, Amount											12,000,000									$ 12,000,000
Debt Instrument, Final Payoff Amount, Threshold Above Which the Reporting Entity Will First Pay Without Resorting to Letter of Credit											59,000,000
CRG [Member] \| Term Loan Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage																					14.00%
Debt Instrument, Interest Rate in the Event of Default																					18.00%
Primary Bank Account Cash Taken Possession Of By Creditor													$ 4,100,000
Repayments of Debt											59,000,000
CRG [Member] \| Term Loan Agreement [Member] \| CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Repayments of Debt										$ 59,000,000	59,000,000
CRG [Member] \| Term Loan Agreement [Member] \| Minimum [Member]
Debt Instrument, Agreed-upon Final Payoff Amount											47,000,000
CRG [Member] \| Term Loan Agreement [Member] \| Maximum [Member]
Debt Instrument, Agreed-upon Final Payoff Amount											$ 66,000,000				$ 66,000,000