Note 14 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Apr. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
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
Subsequent Event [Member] | Private Placement [Member] | Robert W. Duggan [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