Note 10 - Equity, Share-based Compensation, Warrants and Securities Offerings - Information Regarding Common Stock Issued (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Shares issued (in shares)	137,698	70,858
Weighted Average Grant Date Fair Value Per Share (in dollars per share)
Director [Member] | Common Stock [Member]
Shares issued (in shares)	34,875	13,608
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 6.71	$ 7.95
Employees [Member] | Common Stock [Member]
Shares issued (in shares)	89,307	57,250
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 5.75	$ 5.52
Consultants [Member] | Common Stock [Member]
Shares issued (in shares)	13,516	0
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 6.47