The average gross profit margin on sales to related party.

No definition available.

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

- Definition

Purchases of products during the period 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

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

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=56944662&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

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.

+ 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 FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: 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

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_StarlightElectronicsCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_StarlightConsumerElectronicsUsaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_StarlightRdLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_CosmoCommunicationsUsaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_WinglightPacificLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_SecCosmoUsaAndStarlightElectronicsUsaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=smdm_StarlightUsaCosmoAndSecMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2016
Related Party Transaction [Line Items]
Warehouse space Square Foot Value			$ 0.096
Starlight Electronics Co., Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party			$ 116,000	$ 403,000
Related Party Gross Margin Percentage (in percentage)			16.00%	16.50%
Related Party Purchases From Related Party Transaction One	$ 1,396,000	$ 0	$ 4,206,000	$ 0
Proceeds from Fees Received	0	64,000	0	181,000
Starlight Consumer Electronics USA, Inc [Member]
Related Party Transaction [Line Items]
Related Party Purchases From Related Party Transaction One	151,000	221,000	306,000	2,042,000
Starlight Rd, Ltd [Member]
Related Party Transaction [Line Items]
Related Party Purchases From Related Party Transaction One	59,000	1,275,000	679,000	4,704,000
Cosmo Communications Usa, Inc [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Revenues from Transactions with Related Party	516,000	14,000	961,000	259,000
Winglight Pacific, Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 368,000	$ 276,000	$ 1,539,000	$ 1,249,000
Related Party Gross Margin Percentage (in percentage)	25.10%	0.00%	22.40%	16.30%
SEC, Cosmo USA and Starlight Electronics USA [Member]
Related Party Transaction [Line Items]
Proceeds from Fees Received	$ 36,000	$ 312,014	$ 83,000	$ 0
Starlight USA, Cosmo And SEC [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Reimbursement Revenue					$ 100,000