Note 12 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 30, 2023	Sep. 20, 2022	Mar. 31, 2023	Dec. 31, 2022
Accrued Liabilities, Current			$ 3,091	$ 2,595
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001	$ 0.001
Subsequent Event [Member] | Loan Agreement [Member]
Debt Instrument, Decrease, Forgiveness	$ 65,000
Robert W. Duggan [Member] | Subsequent Event [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
Fee Payable to Related Party			$ 1,000
Accrued Liabilities, Current			$ 800
Related Party Transaction, Amounts of Transaction		$ 65,000