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Note 7 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

		March 31, 2021
(in thousands)		Cost				Unrealized Gains				Unrealized Losses				Fair Value
U.S. municipal securities		$	19,281			$	51			$	(5	)		$	19,327
Corporate debt securities			20,010				78				(30	)			20,058
U.S. government agency securities			3,500				1				(2	)			3,499
Certificates of deposit/time deposits			5,395				73				-				5,468
Commercial paper			1,000				-				-				1,000
Total marketable securities		$	49,186			$	203			$	(37	)		$	49,352

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

		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]

		March 31,
(in thousands)		2021
Due in one year or less		$	19,592
Due after one year through five years			29,760
Total marketable securities		$	49,352

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- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Topic 320
-SubTopic 10
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