Note 9 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Marketable Securities [Table Text Block]

	September 30, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Marketable securities
Corporate debt securities	$	989,000		-	$	(6,000	)	$	983,000