Note 10 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	May 31, 2023	Apr. 30, 2023	Sep. 20, 2022	Mar. 31, 2023	Mar. 31, 2024	Dec. 31, 2023
Accrued Liabilities, Current					$ 2,268	$ 3,814
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001	$ 0.001
Loan Agreement [Member]
Debt Instrument, Decrease, Forgiveness		$ 65,000
Interest Payable		$ 200
Robert W. Duggan [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		10,022,937
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
Shares Issued, Price Per Share (in dollars per share)		$ 6.51
Letter Agreement [Member] | Robert W. Duggan [Member]
Directors and Officers Liability Insurance, Period (Year)				1 year
Related Party Transaction, Amounts of Transaction	$ 1,000		$ 65,000
Accrued Liabilities, Current					$ 0