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Note 8 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

		*June 30, 2022*
(in thousands)		*Cost*				*Unrealized Gains*				*Unrealized Losses*				*Fair Value*
U.S. municipal securities		$	17,893			$	-			$	(365	)		$	17,528
Corporate debt securities			12,299				-				(234	)			12,065
U.S. government agency securities			22,284				2				(355	)			21,931
Certificates of deposit/time deposits			941				-				(6	)			935
Commercial paper			2,994				-				(6	)			2,988
Total marketable securities		$	56,411			$	2			$	(966	)		$	55,447

		*December 31, 2021*
(in thousands)		*Cost*				*Unrealized Gains*				*Unrealized Losses*				*Fair Value*
U.S. municipal securities		$	12,549			$	-			$	(70	)		$	12,479
Corporate debt securities			9,303				-				(44	)			9,259
U.S. government agency securities			2,500				-				(12	)			2,488
Certificates of deposit/time deposits			1,687				7				-				1,694
Commercial paper			-				-				-				-
Total marketable securities		$	26,039			$	7			$	(126	)		$	25,920

Investments Classified by Contractual Maturity Date [Table Text Block]

		*June 30,*
(in thousands)		*2022*
Due in one year or less		$	24,379
Due after one year through five years			31,068
Total marketable securities		$	55,447