Note 4 - Prepaid Expenses and Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

	March 31,		December 31,
(in thousands)	2024		2023
Metals to be used in research and development	$	1,826	$	1,909
Research and development tax credits receivable		1,442		1,195
Other		832		568
Total prepaid expenses and other current assets	$	4,100	$	3,672