Concentrations (Details Narrative) - USD ($)	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018
Cash, FDIC insured amount	$ 250,000	$ 250,000
Uninsured amount	$ 4,082,000	$ 3,591,000
Sales (Security Alarm) [Member] \| Customer Concentration Risk [Member]
Percentage of concentration risk	41.00%	34.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Percentage of concentration risk	61.00%	55.00%
Sales (Security Switch) [Member] \| Customer Concentration Risk [Member]
Percentage of concentration risk	78.00%	71.00%
Wells Fargo Bank [Member]
Uninsured amount	$ 399,000	$ 224,000

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration