SCHEDULE OF LONG TERM DEBT (Details) (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
LongTermDebtLineItem [Line Items]
Repayment of debt	$ 4,318,188	$ 1,517,500
Term Loan [Member] \| ENP Mendota, LLC [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	10 years	10 years
Debt interest rate	7.18%	7.18%
Term Loan [Member] \| ENP Peru One [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	10 years	10 years
Debt interest rate	7.18%	7.18%
Term Loan [Member] \| ENP Peru Investments [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	10 years	10 years
Debt interest rate	5.40%	5.40%
Term Loan [Member] \| Nano Chem Two [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	5 years	5 years
Debt interest rate	7.00%	7.00%
Term Loan [Member] \| Nano Chem [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	3 years	3 years
Debt interest rate	4.90%	4.90%
Term Loan [Member] \| Nano Chem One [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	3 years	3 years
Debt interest rate	6.50%	6.50%
Term Loan [Member] \| 317 Mendota LLC [Member]
LongTermDebtLineItem [Line Items]
Debt instrument term	5 years	5 years
Debt interest rate	6.79%	6.79%
Repayment of debt	$ 2,024,710	$ 2,024,710

No definition available.

Name:	FSI_LongTermDebtLineItem
Namespace Prefix:	FSI_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(i)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=FSI_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_ENPMendotaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_ENPPeruOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_ENPPeruInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_NanoChemTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_NanoChemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FSI_NanoChemOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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