Maximum funded indebtedness to adjusted earnings before interest taxes depreciation and amortization ratio.

No definition available.

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Balance Type:	na
Period Type:	instant

- Definition

Minimum debt service coverage ratio.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	num: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

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 for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Description of when the fee for available but unused credit capacity is required to be paid (for example, annually, quarterly, or monthly).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

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Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Data Type:	na
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- Details

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- Details

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Long-Term Debt and Line-of-Credit - Additional Information (Details) - USD ($)		3 Months Ended
	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Component of interest expense		$ 6,300
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, frequency of commitment fee payment		quarterly
Unused commitment fee percentage		0.50%
Credit Agreement
Debt Instrument [Line Items]
Minimum debt service coverage ratio			125.00%
Maximum funded indebtedness to adjusted EBITDA ratio			300.00%
JPMorgan Chase Bank, N. A. \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, effective interest rate		3.78%
Credit facility amount	$ 4,000,000
Credit facility, terminate date		Jun. 30, 2019
JPMorgan Chase Bank, N. A. \| Term Loan \| Credit Agreement
Debt Instrument [Line Items]
Debt instrument, amount	$ 2,400,000
Debt instrument, periodic payment		quarterly payments
Debt instrument, term	3 years
Debt instrument, effective interest rate		4.53%
JPMorgan Chase Bank, N. A. \| LIBO Rate \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate	3.00%
JPMorgan Chase Bank, N. A. \| LIBO Rate \| Term Loan \| Credit Agreement
Debt Instrument [Line Items]
Debt instrument, variable interest rate	3.75%
JPMorgan Chase Bank, N. A. \| Prime Rate \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate	0.25%
JPMorgan Chase Bank, N. A. \| Prime Rate \| Term Loan \| Credit Agreement
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.00%
JPMorgan Chase Bank, N. A. \| Floor Rate \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, variable interest rate	2.50%
JPMorgan Chase Bank, N. A. \| Floor Rate \| Term Loan \| Credit Agreement
Debt Instrument [Line Items]
Debt instrument, variable interest rate	2.50%