XML 20 R39.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitments (Tables) (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Commitments [Abstract] |
Schedule of Future Minimum Lease Commitments | Future minimum lease commitments under these leases at December 31, 2012 are as follows:
2013 | $ | 179,000 |
2014 | 178,000 |
2015 | 127,000 |
2016 | 68,000 |
2017 | 34,000 |
Thereafter | — |
Total | $ | 586,000 |
Schedule of Rent Expense | The following table presents rent expense for the years ended December 31, 2012, 2011 and 2010, respectively.
| For the years ended December 31,
| 2012 | 2,010 |  | 2011 | 2,010 |  | 2010
Minimum rentals | $ | 139,000 |  | — |  | $ | 52,000 |  | — |  | $ | 65,000 |
Less: Sublease rentals | 7,000 |  | — |  | — |  | — |  | — |
| $ | 132,000 |  |  | $ | 52,000 |  |  | $ | 65,000 |

X
- Details
Name: | gpor_CommitmentsAbstract
Namespace Prefix: | gpor_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
Name: | us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_ScheduleOfRentExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration