Name:	sodi_IncomeTaxesTextualAbstract
Namespace Prefix:	sodi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Period for cumulative change in ownership.

No definition available.

Name:	sodi_PeriodForCumulativeChangeInOwnership
Namespace Prefix:	sodi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Valuation allowance recorded on deferred tax assets percentage.

No definition available.

Name:	sodi_ValuationAllowanceRecordedOnDeferredTaxAssetsPercentage
Namespace Prefix:	sodi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

Name:	us-gaap_OperatingLossCarryforwardsExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

No definition available.