Note 7 - Warrants (Details Textual) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares
Class Of Warrant Or Right, Issued During Period (in shares) | shares	194	194
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Class of Warrant or Right, Exercised During Period (in shares) | shares	194	194
Class of Warrant or Right, Granted During the Period, Fair Value Per Share (in dollars per share) | $ / shares	$ 50.32	$ 50.32
Amortization of Warrants	$ 1,150	$ 1,150
Measurement Input, Exercise Price [Member]
Warrants and Rights Outstanding, Measurement Input	0.01	0.01
Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0	0
Current Prepaid Expenses [Member]
Warrants and Rights Outstanding	$ 4,600	$ 4,600
Other Current Assets [Member]
Warrants and Rights Outstanding	$ 4,026	$ 4,026