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v3.22.4

Derivative Instruments (Details Narrative) | 12 Months Ended
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Dec. 31, 2021 USD ($)
Kinross Calls [Member] |
Proceeds from sale of covered calls | $ 8,000

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Namespace Prefix: | sodi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=sodi_KinrossCallsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |