Note 12 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended
	May 31, 2023	Apr. 30, 2023	Sep. 20, 2022	Jun. 09, 2022	Mar. 31, 2023	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Accrued Liabilities, Current						$ 3,814		$ 2,595
Common Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.001		$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0		$ 2.05
Loan Agreement [Member]
Debt Instrument, Decrease, Forgiveness		$ 65,000
Interest Payable		$ 200
Rights Offering [Member]
Equity Offering, Units, Sale of Units (in shares)				7,317,072
Shares Issued, Price Per Share (in dollars per share)				$ 2.05
Number of Shares Per Unit Issued (in shares)				1
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.001
Number of Warrants Per Unit (in shares)				1
Stock Issued During Period, Shares, New Issues (in shares)				7,317,072
Robert W. Duggan [Member] | Rights Offering [Member]
Equity Offering, Units, Sale of Units (in shares)				7,317,072
Shares Issued, Price Per Share (in dollars per share)				$ 2.05
Number of Shares Per Unit Issued (in shares)				1
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.001
Number of Warrants Per Unit (in shares)				1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 2.05
Investment Owned, Percent of Net Assets				56.00%
Robert W. Duggan [Member] | Private Placement [Member]
Shares Issued, Price Per Share (in dollars per share)		$ 6.51
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
Stock Issued During Period, Shares, New Issues (in shares)		10,022,937
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