Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2023	Nov. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Proceeds from Issuance of Common Stock			$ 3,126	$ 76,237
Payments of Stock Issuance Costs			$ 94	$ 495
Private Investment in Public Entity Offering [Member]
Stock Issued During Period, Shares, New Issues		25,000,000
Shares Issued, Price Per Share		$ 3.21
Proceeds from Issuance of Common Stock		$ 80,300
Payments of Stock Issuance Costs		4,500
Proceeds from Issuance of Common Stock, Net		$ 75,700
At The Market [Member]
Stock Issued During Period, Shares, New Issues	951,873
Shares Issued, Price Per Share	$ 3.28
Proceeds from Issuance of Common Stock	$ 3,100
Proceeds from Issuance of Common Stock, Net	$ 3,000