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Commitments and Contingencies (Details Narrative) - USD ($) | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Commitments And Contingencies [Line Items] |  |
Rent expense | $ 700,000 | $ 600,000
Effective May 1, 2018 [Member] |  |
Commitments And Contingencies [Line Items] |  |
Lease expire | Apr. 30, 2021 |
Rent expense | $ 1,600 |
Macau Subsidiary [Member] |  |
Commitments And Contingencies [Line Items] |  |
Lease expire | Apr. 30, 2018 |

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- Definition custom:CommitmentsAndContingenciesLineItems + References No definition available. + Details
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Namespace Prefix: | SMDM_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreationDateAxis=SMDM_EffectiveMayOneTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=SMDM_MacauSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |