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Stock Options (Details Narrative) - $ / shares | 6 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Stock Options |  |
Number of stock option issued during period | 0 | 1,000,000
Stock option of exercise price | $ 0 | $ 0.38

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

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration