Note 8 - Controlled Launch (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 28, 2021
Number of KOLs			70
Controlled Launch, Program Expenses	$ 0	$ 600
Revenue from Contract with Customer, Excluding Assessed Tax	0	700
CellFX System [Member]
Contract with Customer, Receivable, Credit Loss Expense (Reversal)		(500)
Controlled Launch [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		100
Redemption of Non Cash Credits [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0	$ 400
Minimum [Member]
Number of Patients Participating in Procedure			40
Maximum [Member]
Number of Patients Participating in Procedure			50