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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, 2019 | Mar. 31, 2018
Reserve For Sales Returns |  |
Reserve for sales returns at beginning of the fiscal year | $ 726,000 | $ 600,000
Provision for estimated sales returns | 3,997,946 | 3,775,846
Sales returns received | (3,827,792) | (3,649,846)
Reserve for sales returns at end of the year | $ 896,154 | $ 726,000

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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