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Reserve for Sales Returns (Details Narrative) | 12 Months Ended
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Mar. 31, 2019
Reserve For Sales Returns Details Narrative Abstract |
Reserve for sales return, description | Customers are either allowed to return defective goods within a specified period of time after shipment (between 6 and 9 months) or granted a "defective allowance" consisting of a fixed percentage (between 1% and 5%) off of invoice price in lieu of returning defective products.

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- Definition Reserve for sales returns, description. + References No definition available. + Details
Name: | SMDM_ReserveForSalesReturnsDescription
Namespace Prefix: | SMDM_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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