Note 12 - Stock Warrants
|3 Months Ended|
Mar. 31, 2023
|Notes to Financial Statements|
|Stock Warrants Disclosure [Text Block]||
As of March 31, 2023, there are warrants outstanding to purchase 23,363,966 shares of Common Stock. The warrants are exercisable at prices ranging from $0.50 to $49.80 per share with a weighted average exercise price per share of $0.54. The warrants have remaining outstanding terms ranging from 0.2 to 4.4 years.