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Notes Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Notes receivable    
Notes receivable $ 4,099geos_ProceedsFromNotesReceivable $ 3,814geos_ProceedsFromNotesReceivable
Total 4,099geos_ProceedsFromNotesReceivableNet 3,814geos_ProceedsFromNotesReceivableNet
Less current portion 4,075us-gaap_NotesAndLoansReceivableNetCurrent 3,786us-gaap_NotesAndLoansReceivableNetCurrent
Non-current notes receivable $ 24us-gaap_NotesAndLoansReceivableNetNoncurrent $ 28us-gaap_NotesAndLoansReceivableNetNoncurrent