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REFUNDS DUE TO CUSTOMERS (Details Narrative) - USD ($) | Dec. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | --- | ---
Refund due to customer | $ 90,000 | $ 145,000 |
Refund due to customer | $ 90,075 | $ 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
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Namespace Prefix: | SMDM_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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 https://asc.fasb.org/extlink&oid=126920602&loc=SL49130611-203046-203046 + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |