Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_DebtDefaultLongtermDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ 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

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (210.5-03(11))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69F
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69E
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1F
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611

+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16)(a)(2))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

Name:	us-gaap_LoansPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=FSI_MidlandBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	dei_LegalEntityAxis=FSI_NanoChemSolutionsIncMember
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:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=FSI_PaycheckProtectionProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=FSI_FordMotorCreditCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=FSI_StockYardsBankTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

LONG TERM DEBT (Details Narrative) - USD ($)	1 Months Ended					12 Months Ended
LONG TERM DEBT (Details Narrative) - USD ($)	Jun. 30, 2022	Oct. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Jan. 31, 2018	Dec. 31, 2022	Dec. 31, 2021
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage						3.00%
Interest expense						$ 292,949	$ 199,930
Nano Chem [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount						2,000,000
Interest expense debt						23,632
Debt Long term debt amount						$ 1,036,798
Nano Chem [Member] \| Term Loan [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage						6.50%
Midland Bank [Member] \| ENP Investments, LLC [Member]
Short-Term Debt [Line Items]
Debt instrument face amount					$ 200,000
Debt instrument interest rate stated percentage					5.25%
Debt instrument term					7 years
Interest expense debt							2,788
Midland Bank [Member] \| NanoChem Solutions Inc [Member]
Short-Term Debt [Line Items]
Debt instrument face amount		$ 894,253
Debt instrument term		2 years
Interest expense debt						$ 5,816	24,827
Debt Long term debt amount							381,674
Midland Bank [Member] \| NanoChem Solutions Inc [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage		3.85%
Midland Bank [Member] \| NanoChem Solutions Inc [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount		$ 1,980,947
Debt instrument interest rate stated percentage		65.00%
Debt instrument term		5 years
Interest expense debt						30,334	69,831
Debt Long term debt amount							1,554,044
Midland Bank [Member] \| NanoChem Solutions Inc [Member] \| Term Loan [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage		3.85%
Midland Bank [Member] \| ENP Mendota, LLC [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount				$ 450,000
Debt instrument interest rate stated percentage				2.50%
Debt instrument term				5 years
Interest expense debt						18,590	17,107
Debt Long term debt amount						415,430	430,880
Midland Bank [Member] \| Nano Chem [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount	$ 1,935,000
Debt instrument interest rate stated percentage	65.00%
Debt instrument term	3 years
Interest expense debt						45,113
Debt Long term debt amount						1,632,672
Midland Bank [Member] \| Nano Chem [Member] \| Term Loan [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage	4.90%
Midland Bank [Member] \| ENP Peru One [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount				$ 3,000,000		2,813,015
Debt instrument term				10 years
First mortgage				$ 2,849,500
Interest expense						62,679
Midland Bank [Member] \| ENP Peru One [Member] \| Term Loan [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage				4.35%
Midland Bank [Member] \| ENP Peru Investments [Member] \| Term Loan [Member]
Short-Term Debt [Line Items]
Debt instrument face amount	$ 259,000
Debt instrument term	10 years
Interest expense debt						7,077
Debt Long term debt amount						$ 256,162
Midland Bank [Member] \| ENP Peru Investments [Member] \| Term Loan [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage	5.40%
Paycheck Protection Program [Member] \| NanoChem Solutions Inc [Member]
Short-Term Debt [Line Items]
Debt instrument face amount			$ 322,000
Debt instrument interest rate stated percentage			1.00%
Debt instrument term			2 years
Ford Motor Credit Company [Member] \| ENP Investments, LLC [Member]
Short-Term Debt [Line Items]
Debt instrument face amount			$ 215,960
Debt instrument interest rate stated percentage			1.00%
Debt instrument term			2 years
Stock Yards Bank & Trust [Member] \| ENP Realty LLC [Member]
Short-Term Debt [Line Items]
Debt instrument term				10 years
Stock Yards Bank & Trust [Member] \| ENP Realty LLC [Member] \| Prime Rate [Member]
Short-Term Debt [Line Items]
Debt instrument interest rate stated percentage				4.35%