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Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Proceeds from Issuance of Common Stock		$ 7,174	$ 38,187
The 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		605,848	250,171
Proceeds from Issuance of Common Stock		$ 7,200	$ 3,900
Payments of Stock Issuance Costs		$ 200	$ 100
Subsequent Event [Member] | The 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	272,303
Proceeds from Issuance of Common Stock	$ 3,100
Payments of Stock Issuance Costs	$ 100

X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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