Note 6 - Shareholders' Equity (Details Textual) - Common Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Feb. 24, 2024	Mar. 31, 2024	Mar. 31, 2023
Stock Issued During Period, Shares, New Issues (in shares)		929	10
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	929
Shares Issued, Price Per Share (in dollars per share)	$ 35
Proceeds from Issuance of Common Stock	$ 32,500
Legal Fees	$ 282