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Note 7 - Stockholders' Equity (Details Textual) - USD ($)				3 Months Ended		12 Months Ended
	Mar. 31, 2023	Apr. 12, 2022	Mar. 29, 2021	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Proceeds from Issuance of Common Stock				$ 244,000	$ 0
Payments of Stock Issuance Costs				$ 180,000	$ (0)
Underwriters [Member]
Stock Issued During Period, Shares, New Issues			80,000
Purchase Agreement with Lincoln Park [Member]
Sale of Stock, Aggregate Value, Maximum			$ 20,000,000
Stock Issued During Period, Shares, New Issues			373,832
Shares Issued, Price Per Share			$ 5.35
Proceeds from Issuance of Common Stock			$ 2,000,000
Stock Issuable, Commitment Shares on Pro Rata Basis			5,000
Sales Agreement with Cantor Fitzgerald Co (Cantor) [Member]
Sale of Stock, Aggregate Value, Maximum	$ 8,500,000	$ 10,500,000
Stock Issued During Period, Shares, New Issues						106,241
Proceeds from Issuance of Common Stock						$ 244,000
Accrued Sales Commission, Current, Percentage		3.00%
Payments of Stock Issuance Costs						$ 13,000

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