Note 11 - Restructuring (Details Textual) $ in Thousands			3 Months Ended		12 Months Ended
	Feb. 08, 2024	May 09, 2023	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Restructuring Charges			$ 558	$ 0
Restructuring Reserve			438		$ 193
Accrued Expenses and Other Current Liabilities [Member]
Restructuring Reserve			300		100
Other Liabilities [Member]
Restructuring Reserve			100		100
Employee Severance [Member]
Restructuring Charges			551		1,600
Restructuring Reserve			$ 242		$ 0
Employee Severance [Member] | Employees [Member]
Restructuring and Related Cost, Number of Positions Eliminated	17	50
Employee Severance [Member] | Contractors [Member]
Restructuring and Related Cost, Number of Positions Eliminated	26	15