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Note 8 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

		*March 31, 2022*
(in thousands)		*Cost*				*Unrealized Gains*				*Unrealized Losses*				*Fair Value*
U.S. municipal securities		$	14,889			$	-			$	(264	)		$	14,625
Corporate debt securities			12,144				-				(180	)			11,964
U.S. government agency securities			17,288				-				(188	)			17,100
Certificates of deposit/time deposits			1,438				2				(2	)			1,438
Commercial paper			2,987				-				(4	)			2,983
Total marketable securities		$	48,746			$	2			$	(638	)		$	48,110

		*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]

		*March 31,*
(in thousands)		*2022*
Due in one year or less		$	19,914
Due after one year through five years			28,196
Total marketable securities		$	48,110