Note 4 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Carrying		Fair Value Measurement at June 30, 2022
	Value		Level 1		Level 2		Level 3
	(Unaudited - In thousands)
Cash and cash equivalents	$	17,510	$	17,510	$	—	$	—
Restricted cash	$	25	$	25	$	—	$	—
Ownership interests	$	2,407	$	2,407	$	—	$	—

	Carrying		Fair Value Measurement at December 31, 2021
	Value		Level 1		Level 2		Level 3
	(Unaudited - In thousands)
Cash and cash equivalents	$	24,739	$	24,739	$	—	$	—
Restricted cash	$	25	$	25	$	—	$	—
Ownership interests	$	4,549	$	4,549	$	—	$	—