XML 33 R23.htm IDEA: XBRL DOCUMENT

Note 7 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

		*June 30, 2021*
(in thousands)		*Cost*				*Unrealized Gains*				*Unrealized Losses*				*Fair Value*
U.S. municipal securities		$	20,968			$	43			$	(17	)		$	20,994
Corporate debt securities			19,062				68				(29	)			19,101
U.S. government agency securities			1,500				-				(2	)			1,498
Certificates of deposit/time deposits			5,394				54				-				5,448
Total marketable securities		$	46,924			$	165			$	(48	)		$	47,041

		*December 31, 2020*
(in thousands)		*Cost*				*Unrealized Gains*				*Unrealized Losses*				*Fair Value*
U.S. municipal securities		$	25,003			$	83			$	(2	)		$	25,084
Corporate debt securities			42,048				211				(11	)			42,248
U.S. government agency securities			18,500				6				(10	)			18,496
Certificates of deposit/time deposits			5,395				93				-				5,488
Commercial paper			2,499				-				-				2,499
Total marketable securities		$	93,445			$	393			$	(23	)		$	93,815

Investments Classified by Contractual Maturity Date [Table Text Block]

		*June 30,*
(in thousands)		*2021*
Due in one year or less		$	18,341
Due after one year through five years			28,700
Total marketable securities		$	47,041