Debt Instrument, Additional Face Amount.

No definition available.

Name:	slgd_DebtInstrumentAdditionalFaceAmount
Namespace Prefix:	slgd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Description of reference rate used for variable rate of debt instrument.

+ References

No definition available.

+ Details

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

- Definition

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

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+ Details

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

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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+ Details

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

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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+ Details

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

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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

- 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

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

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

- Definition

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

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+ Details

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

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=slgd_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
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Namespace Prefix:
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- Details

Name:	srt_StatementScenarioAxis=slgd_IfTaxRefundReceivedFromInternalRevenueServiceMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Long-Term Debt and Line-of-Credit - Additional Information (Details) - USD ($) $ in Thousands						3 Months Ended	12 Months Ended
	Feb. 28, 2023	Jan. 23, 2023	Aug. 10, 2022	Nov. 09, 2021	Jul. 01, 2020	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt outstanding							$ 3,504
Repayments of term loan							2,000	$ 1,583
Revolving Credit Facility
Debt Instrument [Line Items]
Debt outstanding							2,504
UMB Bank, N.A
Debt Instrument [Line Items]
Unamortized loan costs							100	297
UMB Bank, N.A \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt outstanding							$ 2,504
Debt outstanding interest rate							11.19%
UMB Bank, N.A \| Term Loan
Debt Instrument [Line Items]
Debt outstanding							$ 0
Debt outstanding interest rate							10.67%
UMB Bank, N.A \| Loan Agreement \| Term Loan
Debt Instrument [Line Items]
Term loan amount					$ 3,000
Term loan, frequency of commitment fee payment					monthly
Term loan, payment term					3 years
UMB Bank, N.A \| Consent and Seventh Amendment to Loan and Security Agreement \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Credit facility, terminate date		Feb. 27, 2023
UMB Bank, N.A \| Maximum \| Loan Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Available borrowing capacity amount			$ 4,000
UMB Bank, N.A \| Maximum \| Consent and Seventh Amendment to Loan and Security Agreement \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Available borrowing capacity amount		$ 500
UMB Bank, N.A \| If Tax Refund Received from Internal Revenue Service \| Maximum \| Consent and Seventh Amendment to Loan and Security Agreement \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Available borrowing capacity amount		$ 250
La Plata Capital, LLC
Debt Instrument [Line Items]
Debt outstanding							$ 1,000
Unamortized loan costs							$ 20	$ 41
La Plata Capital, LLC \| Loan Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, terminate date				Nov. 09, 2023			Nov. 09, 2023
La Plata Capital, LLC \| Loan Agreement \| Term Loan
Debt Instrument [Line Items]
Term loan amount				$ 2,000
Debt outstanding effective interest rate				14.00%
Term loan, maturity date				Nov. 09, 2021
Term loan, monthly principal payments				$ 30
Repayments of term loan						$ 1,000
Term loan, payment terms							Interest-only payments are required on a monthly basis beginning in January 2022 and ending on December 31, 2022. Beginning on January 1, 2023, monthly principal payments of $30 are required in addition to accrued and unpaid interest. All remaining unpaid principal and interest are fully due on November 9, 2023.
La Plata Capital, LLC \| First Amendment \| Term Loan
Debt Instrument [Line Items]
Term loan, payment terms							The First Amendment states interest-only payments are required on a monthly basis through March 31, 2023.
La Plata Capital, LLC \| Second Amendment \| Promissory Note \| Subsequent Event
Debt Instrument [Line Items]
Additional term loan amount	$ 250
Debt outstanding effective interest rate	15.00%
Term loan, monthly principal payments	$ 30
Term loan, payment terms	Interest-only payments are required on a monthly basis through June 30, 2023, with monthly principal payments of $30 beginning on July 1, 2023.
Floor Rate \| UMB Bank, N.A \| Loan Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate			7.75%
SOFR Rate \| UMB Bank, N.A \| Loan Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate			6.83%
Debt Instrument, Maturity of Variable interest rate							one-month term SOFR rate