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Reserve for Sales Returns - Schedule of Reserve for Sales Returns (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
First Priority Lien Percentage |  |
Reserve for sales returns at beginning of the year | $ 1,224,000 | $ 896,000
Provision for estimated sales returns | 3,881,000 | 5,771,000
Sales returns received | (4,145,000) | (5,443,000)
Reserve for sales returns at end of the period | $ 960,000 | $ 1,224,000

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- Definition Provision for estimated sales returns. + References No definition available. + Details
Name: | SMDM_ProvisionForEstimatedSalesReturns
Namespace Prefix: | SMDM_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reserve for sales returns. + References No definition available. + Details
Name: | SMDM_ReserveForSalesReturns
Namespace Prefix: | SMDM_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Sales returns received. + References No definition available. + Details
Name: | SMDM_SalesReturnsReceived
Namespace Prefix: | SMDM_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration