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Refunds Due to Customers (Details Narrative) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Refund due to customer | $ 145,408 | $ 806,475
One Major Customer [Member] |  |
Refund due to customer |  | 1,700,000
Deducted on payment remittances |  | 1,200,000
Two Major Customer [Member] |  |
Refund due to customer |  | $ 300,000

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- Definition Deducted on payment remittances. + References No definition available. + Details
Name: | SMDM_DeductedOnPaymentRemittances
Namespace Prefix: | SMDM_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123410239&loc=SL49130611-203046-203046 + Details
Name: | us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_MajorCustomersAxis=SMDM_OneMajorCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=SMDM_TwoMajorCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |