Note 11 - Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,
	2023		2022
Systems	$	—	$	367
Cycle units		—		77
Total consolidated revenue	$	—	$	444

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended March 31,
	2023		2022
North America	$	—	$	312
Rest of World		—		132
Total consolidated revenue	$	—	$	444