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Note 3 - Investments (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

		March 31, 2022
										Gross				Gross
		Amortized				Accrued				Unrealized				Unrealized				Estimated
		Cost				Interest				Gains				Losses				Fair Value
Obligations of U.S. Government and its agencies		$	42,005			$	98			$	1			$	(42	)		$	42,062
Corporate debt securities			4,272				19				—				(32	)			4,259
Certificates of deposit			1,648				3				—				(8	)			1,643
Total investments		$	47,925			$	120			$	1			$	(82	)		$	47,964

		December 31, 2021
										Gross				Gross
		Amortized				Accrued				Unrealized				Unrealized				Estimated
		Cost				Interest				Gains				Losses				Fair Value
Obligations of U.S. Government and its agencies		$	4,043			$	17			$	—			$	(7	)		$	4,053
Corporate debt securities			4,294				40				—				(5	)			4,329
Certificates of deposit			1,652				8				—				(1	)			1,659
Total investments		$	9,989			$	65			$	—			$	(13	)		$	10,041

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

		March 31, 2022				December 31, 2021
Maturing in one year or less		$	47,964			$	3,212
Maturing after one year through two years			—				6,829
Total investments		$	47,964			$	10,041

X

- 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
-URI https://asc.fasb.org/topic&trid=2196928

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- 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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

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