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Investments (Tables)

12 Months Ended

Apr. 30, 2022

Investments

Schedule of investments

​

​	​	​	​	​	​	​
​	​	April 30,
​		2022			2021
Short-term investments:	​	​	​	​	​	​
Available-for-sale securities:	​	​	​	​	​	​
Municipal securities	​	​	19,725	​	​	22,245
U.S. government securities	​	​	4,991	​	​	4,009
Corporate bonds	​	​	—	​	​	5,717
Total short-term investments	​	$	24,716	​	$	31,971
Long-term investments:	​	​	​	​	​	​
Available-for-sale securities:	​	​	​	​	​	​
Municipal securities	​	​	—	​	​	988
U.S. government securities	​	​	—	​	​	4,000
Total long-term available-for-sale investments	​		—	​		4,988
Equity method investments	​	​	​	​	​	​
Investment in limited partnership fund	​		15,433	​		7,168
Total equity method investments	​		15,433	​		7,168
Total long-term investments	​	$	15,433	​	$	12,156

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):

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April 30, 2022

​

April 30, 2021

​

​

​

​

Gross

Gross

​

​

​

​

​

Gross

​

Gross

​

​

​

​

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

​

​

​

Cost

​

Gains

​

Losses

​

Value

​

Cost

Gains

​

Losses

Value

​

Municipal securities

​

$

19,756

​

$

—

​

$

(31)

​

$

19,725

​

$

23,227

​

$

8

​

$

(2)

​

$

23,233

​

U.S. government securities

​

​

4,995

​

​

—

​

​

(4)

​

​

4,991

​

​

8,008

​

​

1

​

​

—

​

​

8,009

​

Corporate bonds

​

​

—

​

​

—

​

​

—

​

​

—

​

​

5,718

​

​

—

​

​

(1)

​

​

5,717

​

Total available-for-sale investments

​

$

24,751

​

$

—

​

$

(35)

​

$

24,716

​

$

36,953

​

$

9

​

$

(3)

​

$

36,959

​

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, 2022, are as follows:

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​	​	​	​	​	​	​	​
​		Cost			Fair Value
Due within one year	​	$	24,751	​	$	24,716	​
Due after one year through five years	​		—	​		—	​
Total	​	$	24,751	​	$	24,716	​

X

- Definition

Tabular disclosure of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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- Definition

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+ References

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- Definition

Tabular disclosure of the summary of investment holdings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B)
-URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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