Note 12 - Risks and Uncertainties (Details Textual)	12 Months Ended
Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current	$ 7,000	$ 1,107,000	$ 25,000
Cash, Uninsured Amount	9,100,000	$ 900,000
Foreign Financial Institutions, Actual Deposits	$ 3,100,000
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Customers	2	2
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Largest Customers [Member]
Concentration Risk, Percentage	55.00%	70.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Amazon [Member]
Concentration Risk, Percentage	42.00%	39.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage	13.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Walmart [Member]
Concentration Risk, Percentage		31.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Amazon [Member]
Concentration Risk, Percentage	64.00%	59.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage	20.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Variety Wholesalers [Member]
Concentration Risk, Percentage		19.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Microwave Ovens [Member]
Concentration Risk, Percentage	69.00%	51.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Audio Products [Member]
Concentration Risk, Percentage	25.00%	47.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member]
Number of Factory Suppliers	4	4
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Four Largest Factory Suppliers [Member]
Concentration Risk, Percentage	96.00%	95.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier One [Member]
Concentration Risk, Percentage	49.00%	37.00%
Sales Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Sales Representative Organizations	6	5
Sales Concentration Risk [Member] \| Revenue Benchmark [Member] \| Sales Representative Organizations [Member]
Concentration Risk, Percentage	68.00%	48.00%
Sales Concentration Risk [Member] \| Revenue Benchmark [Member] \| Sales Representative Organizations One [Member]
Concentration Risk, Percentage	43.00%	38.00%
Sales Concentration Risk [Member] \| Revenue Benchmark [Member] \| Sales Representative Organizations Two [Member]
Concentration Risk, Percentage	25.00%	10.00%

Represents number of customers.

No definition available.

Name:	msn_NumberOfCustomers
Namespace Prefix:	msn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of factory suppliers.

+ References

No definition available.

+ Details

Name:	msn_NumberOfFactorySuppliers
Namespace Prefix:	msn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of sales representative organizations.

+ References

No definition available.

+ Details

Name:	msn_NumberOfSalesRepresentativeOrganizations
Namespace Prefix:	msn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of deposits held by branches of foreign institutions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant