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Investments (Tables)

3 Months Ended

Oct. 31, 2020


	October 31,		April 30,
	2020		2020
Short-term investments:
Available-for-sale securities:
Municipal securities		13,279		5,244
U.S. government securities		44,024		33,771
Corporate bonds		9,834		8,492
Total short-term investments	$	67,137	$	47,507
Long-term investments:
Available-for-sale securities:
Municipal securities		5,640		1,592
U.S. government securities		10,001		8,996
Total available-for-sale investments		15,641		10,588
Equity method investments
Investment in limited partnership fund		5,335		4,442
Total equity method investments		5,335		4,442
Total long-term investments	$	20,976	$	15,030

Schedule of activity related to available-for-sale investments recorded in short-term and long-term investments

The following table is a summary of the activity related to the available-for-sale investments recorded in short-term and long-term investments as of October 31, 2020 and April 30, 2020, respectively (in thousands):


	October 31, 2020
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	18,915	$	9	$	(5)	$	18,919
U.S. government securities		54,022		3		—		54,025
Corporate bonds		9,838		—		(4)		9,834
Total available-for-sale investments	$	82,775	$	12	$	(9)	$	82,778


	April 30, 2020
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	6,807	$	29	$	—	$	6,836
U.S. government securities		42,730		41		(4)		42,767
Corporate bonds		8,495		—		(3)		8,492
Total available-for-sale investments	$	58,032	$	70	$	(7)	$	58,095

Schedule of amortized cost and fair value of the available-for-sale debt securities by contractual maturity

The amortized cost and fair value of the available-for-sale debt securities by contractual maturity at October 31, 2020 were as follows (in thousands):


	Cost		Fair Value
Due within one year	$	67,135	$	67,137
Due after one year through five years		15,640		15,641
Total	$	82,775	$	82,778