Date which agreement is set to expire, in CCYY-MM-DD format

No definition available.

Name:	smdm_AgreementExpirationDate
Namespace Prefix:	smdm_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the amount of monthly service fee charged by the reporting company.

+ References

No definition available.

+ Details

Name:	smdm_MonthlyServiceFee
Namespace Prefix:	smdm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of karaoke products owned by the factories during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	smdm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of total manufactured products by the factories during the reporting period.

+ References

No definition available.

+ Details

Name:	smdm_PercentageOfTotalManufacturedProducts
Namespace Prefix:	smdm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the reimbursement of amount paid towards engineering and quality control services performed during the reporting period.

+ References

No definition available.

+ Details

Name:	smdm_ReimbursementPaid
Namespace Prefix:	smdm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The average gross profit margin on sales to related party.

+ References

No definition available.

+ Details

Name:	smdm_RelatedPartyGrossMarginPercentage
Namespace Prefix:	smdm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

Name:	smdm_RelatedPartyPurchasesFromRelatedPartyTransactionOne
Namespace Prefix:	smdm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Repair charges collected from related party for repairing defective goods.

+ References

No definition available.

+ Details

Name:	smdm_RepairCharges
Namespace Prefix:	smdm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the effective interest rate as of the balance sheet date on interest-bearing trade payables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 25

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6451110&loc=d3e27881-108397

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 25

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6451110&loc=d3e27862-108397

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 13, 14, 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_AccountsPayableInterestBearingInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Cost of freight-in, whether based on weight, negotiated freight rates and method of transportation (that is, rail, barge, truck, and so forth).

+ References

+ Details

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

- Definition

The amount of interest expense incurred during the period on a debt or other obligation to a related party.

+ References

No definition available.

+ Details

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

- Definition

The amount of cash paid during the current period for fees which are not defined elsewhere in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received for fees during the current period. This element excludes cash proceeds from license fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 45

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653

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Balance Type:	credit
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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

-Paragraph 2

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

+ Details

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Data Type:	xbrli:monetaryItemType
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RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	1 Months Ended	12 Months Ended						1 Months Ended	12 Months Ended															12 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	Jul. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Affiliated Entity [Member]	Mar. 31, 2012 Affiliated Entity [Member]	Mar. 31, 2013 Starlight Electronics Co., Ltd [Member]	Mar. 31, 2012 Starlight Electronics Co., Ltd [Member]	Aug. 31, 2010 Starlight Consumer Electronics Usa, Inc [Member]	Mar. 31, 2013 Starlight Consumer Electronics Usa, Inc [Member]	Mar. 31, 2012 Starlight Consumer Electronics Usa, Inc [Member]	Mar. 31, 2013 Starlight Marketing Development, Ltd [Member]	Mar. 31, 2012 Starlight Marketing Development, Ltd [Member]	Mar. 31, 2013 Star Fair Electronics Co Ltd [Member]	Mar. 31, 2012 Star Fair Electronics Co Ltd [Member]	Mar. 31, 2013 Starlight Rd, Ltd [Member]	Mar. 31, 2012 Starlight Rd, Ltd [Member]	Mar. 31, 2013 Cosmo Communications Usa, Inc [Member]	Mar. 31, 2012 Cosmo Communications Usa, Inc [Member]	Mar. 31, 2013 Cosmo Communications Hk [Member]	Mar. 31, 2012 Cosmo Communications Hk [Member]	Mar. 31, 2013 Starlight Group [Member]	Mar. 31, 2012 Starlight Group [Member]	Apr. 02, 2012 Starlight Group [Member]	Mar. 31, 2013 Starlight Group [Member] Fiscal 2014 [Member]
Percentage of karaoke products owned by factories																					32.00%
Percentage Of Total Manufactured Products																								33.00%
Related Party Transaction, Revenues from Transactions with Related Party																	$ 419,000	$ 87,000	$ 0	$ 289,000
Related Party Gross Margin Percentage (in percentage)																	14.40%	8.80%
Related Party Transaction, Expenses from Transactions with Related Party				250,000	665,000								3,061,000	923,000	21,000	9,000
Related Party Purchases From Related Party Transaction One		0	137,000						4,961,000	5,750,000							305,000	23,000
Freight Costs									54,000	248,000					229,000	0
Related Party Transaction, Other Revenues from Transactions with Related Party						1,813,000	1,686,000
Reimbursement Revenue		60,000	60,000
Reimbursement Paid		96,000	96,000
Monthly Service Fee	435,000							1,000,000
Proceeds from Fees Received		399,000	0
Agreement Expiration Date								Jul. 31, 2011
Repair Charges											0	115,000	39,000	0
Accounts Payable, Interest-bearing, Interest Rate																							4.50%
Interest Expense, Related Party																					7,294	0
Payments for Fees									$ 0	$ 331,000