Note 12 - Stock Warrants
|3 Months Ended|
Mar. 31, 2022
|Notes to Financial Statements|
|Stock Warrants Disclosure [Text Block]||
As of March 31, 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 1.2 to 13.4 years.