Stock-Based Compensation - Schedule of Stock Appreciation Rights (SARs) (Details) - Stock Appreciation Rights [Member] - shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Outstanding, Beginning balance	71,436	209,962
Stock Appreciation Rights, Granted
Stock Appreciation Rights, Canceled	(71,436)	(138,526)
Outstanding, Ending balance		71,436

Share based compensation arrangement by share based payment award equity instruments other than options cancellations in period.

No definition available.

+ Details

Name:	GLAE_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsCancellationsinPeriod
Namespace Prefix:	GLAE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_AwardTypeAxis=GLAE_StockAppreciationRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: