Note 3 - Net Loss Per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total potential dilutive shares (in shares)	69,124,717	33,910,681
Share-Based Payment Arrangement, Option [Member]
Total potential dilutive shares (in shares)	12,741,394	5,977,179
Performance Shares [Member]
Total potential dilutive shares (in shares)	31,850,000	3,790,755
Restricted Stock [Member]
Total potential dilutive shares (in shares)	388,750	0
Shares Reserved for Convertible Notes [Member]
Total potential dilutive shares (in shares)	8,215,706	8,213,880
Warrant [Member]
Total potential dilutive shares (in shares)	15,928,867	15,928,867