Note 5 - Equity (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Share-based Payment Arrangement, Expensed, Amount [Table Text Block]

	Three Months Ended March 31,
	2022		2021
General and administrative	$	361	$	309
Research and development		166		96
Total stock-based compensation expense	$	527	$	405