The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

OTHER ASSETS - Additional Information (Details)	3 Months Ended		6 Months Ended
OTHER ASSETS - Additional Information (Details)	Oct. 31, 2021 USD ($) ft²	Oct. 31, 2020 USD ($)	Oct. 31, 2021 USD ($) ft²	Oct. 31, 2020 USD ($)	Aug. 31, 2021 ft²
Area of Land \| ft²	143,000		143,000
Office building
Area of Land \| ft²					7,000
Property and equipment \| Right of use assets
Amortization of leased cost \| $	$ 24,000	$ 26,000	$ 36,000	$ 63,000
Right of use assets
Depreciation expense associated with property and equipment \| $	$ 2,000	$ 2,000	$ 3,000	$ 8,000