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REFUNDS DUE TO CUSTOMERS (Details Narrative) - USD ($) | Sep. 30, 2021 | Mar. 31, 2021
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Refunds Due To Customers |  |
Refund due to customer | $ 99,000 | $ 145,000

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

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- Definition Current regulatory liabilities generally represent obligations to make refunds to customers for various reasons including overpayment. + References No definition available. + Details
Name: | us-gaap_CustomerRefundLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant