Note 3 - Liquidity and Summary of Significant Accounting Principles - Anti-dilutive Securities Excluded From the Computation of Diluted Earnings (Loss) Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Anti-dilutive securities (in shares)	4,626,667	1,588,334
Share-Based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	3,376,667	1,355,001
Warrant [Member]
Anti-dilutive securities (in shares)	450,000	233,333
Contingent Warrants Upon Future Financing Events [Member]
Anti-dilutive securities (in shares)	500,000	0
Performance Shares [Member]
Anti-dilutive securities (in shares)	300,000	0