Note 5 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value		Fair value measurement using
	March 31,
(in thousands)	2022		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	14,104	$	14,104	$	-	$	-
Total Assets	$	14,104	$	14,104	$	-	$	-

	Fair Value		Fair value measurement using
	December 31,
(in thousands)	2021		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	21,104	$	21,104	$	-	$	-
Total Assets	$	21,104	$	21,104	$	-	$	-