Note 10 - Equity, Share-based Compensation, Warrants and Securities Offerings - Information Regarding Common Stock Issued (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Shares issued (in shares)	350,400	137,698
Weighted Average Grant Date Fair Value Per Share (in dollars per share)
Director [Member] | Common Stock [Member]
Shares issued (in shares)	104,249	34,875
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 1.11	$ 6.71
Employees [Member] | Common Stock [Member]
Shares issued (in shares)	186,686	89,307
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 4.16	$ 5.75
Consultants [Member] | Common Stock [Member]
Shares issued (in shares)	59,465	13,516
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 1.29	$ 6.47