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

Name:	smdm_PercentageOfKaraokeProductsOwnedByFactories
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

The per pallet of warehouse space occupied by the company.

+ References

No definition available.

+ Details

Name:	smdm_WarehouseSpacePerPallet
Namespace Prefix:	smdm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The value of warehouse square foot.

+ References

No definition available.

+ Details

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

- 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

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 Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

Name:	us-gaap_ProceedsFromFeesReceived
Namespace Prefix:	us-gaap_
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

+ Details

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

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

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

- 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 Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Reference 3: 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 4: 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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

+ Details

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

RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	1 Months Ended	12 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	Jul. 31, 2012	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]
Monthly Service Fee	$ 435,000
Proceeds from Fees Received		330,000	0
Warehouse space Square Foot Value		0.50
Reimbursement Paid		145,000	96,000
Reimbursement Revenue		60,000	60,000
Warehouse Space Per Pallet		$ 8
Subsequent Event [Member]
Related Party Transaction [Line Items]
Monthly Service Fee		180,000
Agreement Expiration Date		Mar. 31, 2015
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Proceeds from Fees Received		0	399,000
Starlight Electronics Co., Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party		1,861,000	1,813,000
Starlight Consumer Electronics Usa, Inc [Member]
Related Party Transaction [Line Items]
Related Party Purchases From Related Party Transaction One		8,012,000	4,932,000
Freight Costs		109,000	54,000
Starlight Consumer Electronics Usa, Inc [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Proceeds from Fees Received		0	250,000
Star Fair Electronics Co Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party		873,000	3,061,000
Repair Charges		52,000	39,000
Starlight Rd, Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party		2,000	21,000
Freight Costs		263,000	229,000
Cosmo Communications Usa, Inc [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Revenues from Transactions with Related Party		1,318,000	410,000
Related Party Gross Margin Percentage (in percentage)		16.20%	14.40%
Related Party Purchases From Related Party Transaction One		41,000	286,000
Starlight Group [Member] \| Fiscal 2014 [Member]
Related Party Transaction [Line Items]
Percentage Of Karaoke Products Owned By Factories		35.00%
Starlight Group [Member] \| Fiscal 2015 [Member]
Related Party Transaction [Line Items]
Percentage Of Total Manufactured Products		30.00%
Cosmo Communications Canada [Member]
Related Party Transaction [Line Items]
Related Party Purchases From Related Party Transaction One		$ 114,000	$ 0