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Note 6 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

		September 30, 2020
(in thousands)		Cost				Unrealized Gains				Unrealized Losses				Fair Value
U.S. municipal securities		$	17,795			$	68			$	-			$	17,863
Corporate debt securities			38,876				283				(25	)			39,134
U.S. government agency securities			19,003				9				(15	)			18,997
Certificates of deposit/time deposits			5,189				105				-				5,294
Commercial paper			1,499				-				-				1,499
Total marketable securities		$	82,362			$	465			$	(40	)		$	82,787

		December 31, 2019
(in thousands)		Cost				Unrealized Gains				Unrealized Losses				Fair Value
U.S. municipal securities		$	10,204			$	9			$	(3	)		$	10,210
Corporate debt securities			26,944				80				(12	)			27,012
U.S. government agency securities			6,274				1				(7	)			6,268
Certificates of deposit/time deposits			1,484				22				-				1,506
Commercial paper			3,491				-				-				3,491
Total marketable securities		$	48,397			$	112			$	(22	)		$	48,487

Investments Classified by Contractual Maturity Date [Table Text Block]

		September 30,
(in thousands)		2020
Due in one year or less		$	30,993
Due after one year through five years			51,369
Total marketable securities		$	82,362

X

- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

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