Note 5 - Promissory Notes (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Proceeds from Notes Payable, Total		$ 188,135
Promissory Note [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Proceeds from Notes Payable, Total	$ 0	188,135	$ 188,135
Interest on Convertible Debt, Equity Portion	15,895	15,615	72,844
Debt Instrument Carrying Amount of The Equity Component		23,461	$ 23,461
Gain on Extinguishment and Reissuance of Promissory Notes With Related Party		$ 94,191
Promissory Note [Member] \| Valuation, Income Approach [Member] \| Measurement Input, Discount Rate [Member]
Long-term Debt, Measurement Input	15

The carrying amount of the equity component of debt which may be settled in cash upon conversion.

No definition available.

Name:	sgldf_DebtinstrumentCarryingAmountOfTheEquityComponent
Namespace Prefix:	sgldf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represnets information about the maount of gain on extinguishment and reissuance of promissory notes with related party

+ References

No definition available.

+ Details

Name:	sgldf_GainOnExtinguishmentAndReissuanceOfPromissoryNotesWithRelatedParty
Namespace Prefix:	sgldf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The interest recognized on equity portion of convertible debt.

+ References

No definition available.

+ Details

Name:	sgldf_InterestOnConvertibleDebtEquityPortion
Namespace Prefix:	sgldf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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
-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

+ Details

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

- Definition

Value of input used to measure long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

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

- Details

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

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: