Note 12 - Stock Warrants
|6 Months Ended|
Jun. 30, 2022
|Notes to Financial Statements|
|Stock Warrants Disclosure [Text Block]||
On March 3, 2022, 550,000 Series NN warrants with an exercise price of $30.00 expired under the terms of the Series NN warrant agreements.
As of June 30, 2022, there are 422,324 warrants outstanding to purchase Navidea's Common Stock. The warrants are exercisable at prices ranging from $0.20 to $49.80 per share with a weighted average exercise price of $2.30 per share. The warrants have remaining outstanding terms ranging from 1.0 to 13.1 years.