Note 4 - Inventory (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	June 30,		December 31,
	2023		2022
Raw materials	$	781	$	752
Work in process1		295		636
Finished goods		18		21
Total inventory, current	$	1,094	$	1,409

Schedule of Inventory, Noncurrent [Table Text Block]

	June 30,		December 31,
	2023		2022
Enriched barium, non-current	$	1,948	$	2,121
Raw materials, non-current		321		275
Total inventory, non-current	$	2,269	$	2,396