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BASIS OF PRESENTATION (Details Narrative)	6 Months Ended
	Jun. 30, 2024
317 Mendota LLC [Member]
Subsidiary company ownership interest rate	80.00%
ENP Investments LLC and ENP Mendota [Member]
Subsidiary company ownership interest rate	65.00%

X

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_OwnershipAxis=FSI_MendotaLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=FSI_ENPInvestmentsLLCAndENPMendotaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: