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Investments (Tables)

12 Months Ended

Apr. 30, 2021

Investments

Schedule of investments


		April 30,
		2021			2020
Short-term investments:
Available-for-sale securities:
Municipal securities			22,245			5,244
U.S. government securities			4,009			33,771
Corporate bonds			5,717			8,492
Total short-term investments		$	31,971		$	47,507
Long-term investments:
Available-for-sale securities:
Municipal securities			988			1,592
U.S. government securities			4,000			8,996
Total available-for-sale investments			4,988			10,588
Equity method investments
Investment in limited partnership fund			7,168			4,442
Total equity method investments			7,168			4,442
Total long-term investments		$	12,156		$	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 April 30, (in thousands):


		April 30, 2021												April 30, 2020
					Gross			Gross									Gross			Gross
		Amortized			Unrealized			Unrealized			Fair			Amortized			Unrealized			Unrealized			Fair
		Cost			Gains			Losses			Value			Cost			Gains			Losses			Value
Municipal securities		$	23,227		$	8		$	(2)		$	23,233		$	6,807		$	29		$	—		$	6,836
U.S. government securities			8,008			1			—			8,009			42,730			41			(4)			42,767
Corporate bonds			5,718			—			(1)			5,717			8,495			—			(3)			8,492
Total available-for-sale investments		$	36,953		$	9		$	(3)		$	36,959		$	58,032		$	70		$	(7)		$	58,095

Schedule of amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of available-for-sale investments

The amortized cost and fair value of the Company’s available-for-sale securities by contractual maturity at April 30, 2021, are as follows:


		Cost			Fair Value
Due within one year		$	31,968		$	31,971
Due after one year through five years			4,985			4,988
Total		$	36,953		$	36,959