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Reserve for Sales Returns - Schedule of Reserve for Sales Returns (Details) - USD ($) | 6 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
First Priority Lien Percentage |  |
Reserve for sales returns at beginning of the year | $ 1,224,000 | $ 896,154
Provision for estimated sales returns | 2,306,668 | 3,543,813
Sales returns received | (1,807,613) | (1,209,322)
Reserve for sales returns at end of the period | $ 1,723,055 | $ 3,230,645

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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