Note 9 - Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2023
Class Of Warrant Or Right, Issued During Period (in shares)			194,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.01
Class of Warrant or Right, Exercised During Period (in shares)				194,000
Class of Warrant or Right, Granted During the Period, Fair Value Per Share (in dollars per share)				$ 50.32
Amortization of Warrants	$ 1,216	$ 1,438
Current Prepaid Expenses [Member]
Warrants and Rights Outstanding	811				$ 2,027
Other Assets [Member]
Warrants and Rights Outstanding	$ 0				$ 0