Note 4 - Short-term Investments (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Debt Securities, Held-to-Maturity [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Fair Value
As of June 30, 2022
U.S. treasury bills	$	3,485	$	-	$	3,485