NET SALES BY PRODUCT LINE AND GEOGRAPHY (Details)	12 Months Ended
Apr. 30, 2019 USD ($) customer	Apr. 30, 2018 USD ($) customer
Revenue from External Customer
Net sales \| $	$ 20,555,000	$ 18,396,000
Number of customers for given percentage annual sales volume \| customer	15
Annual sales volume percentage	91.00%
Number of major customers for given percentage consolidated net sales \| customer	2	2
Number of major customer \| customer	1	1
Major Customer One
Revenue from External Customer
Consolidated net sales percentage	30.00%	34.00%
Consolidated net trade receivables	15	36
Major Customer Two
Revenue from External Customer
Consolidated net sales percentage	21.00%	18.00%
Domestic
Revenue from External Customer
Net sales \| $	$ 18,472,000	$ 16,237,000
Foreign
Revenue from External Customer
Net sales \| $	$ 2,083,000	$ 2,159,000

Represents the percentage of annual sales volume.

No definition available.

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- Definition

Represents the percentage of consolidated net sales.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of consolidated net trade receivables.

+ References

No definition available.

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- Definition

Represents number of customers for a given percentage of annual sales volume.

+ References

No definition available.

+ Details

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- Definition

Represents number of major customers for a given percentage of consolidated net sales.

+ References

No definition available.

+ Details

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- Definition

Represents number of major customers for a given percentage of consolidated net trade receivables.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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