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Debt Issue Costs (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Notes to Financial Statements
Debt issue costs, beginning	$ 316,797	$ 316,797
Total	316,797	316,797
Less: accumulated amortization	(316,797)	(316,797)
Debt issue costs - net

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- Definition

Represent infromation about debt issue costs accumulated amortization.

+ References

No definition available.

+ Details

Name:	safe_DebtIssueCostsAccumulatedAmortization
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represent infromation about debt issue costs.

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No definition available.

+ Details

Name:	safe_DebtIssueCostsBeginning
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represent infromation about debt issue costs ending.

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No definition available.

+ Details

Name:	safe_DebtIssueCostsEnding
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	safe_NotesToFinancialStatementsAbstract
Namespace Prefix:	safe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represent infromation about total.

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No definition available.

+ Details

Name:	safe_Total
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration