XML 21 R17.htm IDEA: XBRL DOCUMENT v2.4.0.6

Marketable Securities (Details Textual) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2012	Sep. 30, 2011
Marketable Securities (Textual) [Abstract]
Net unrealized losses	$ 99,000	$ 3,789,000
Estimated interest accrued	$ 439,000	$ 568,000

X

- Definition

Marketable securities estimated interest accrued.

+ References

No definition available.

+ Details

Name:	genc_MarketableSecuritiesEstimatedInterestAccrued
Namespace Prefix:	genc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	genc_MarketableSecuritiesTextualAbstract
Namespace Prefix:	genc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The sum of the realized and unrealized net gain (loss) on trading securities during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

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