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Notes Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Accounts Receivable Net [Abstract]    
Notes receivable $ 5,928geos_ProceedsFromNotesReceivable $ 3,814geos_ProceedsFromNotesReceivable
Total 5,928geos_ProceedsFromNotesReceivableNet 3,814geos_ProceedsFromNotesReceivableNet
Less current portion 4,404us-gaap_NotesAndLoansReceivableNetCurrent 3,786us-gaap_NotesAndLoansReceivableNetCurrent
Non-current notes receivable $ 1,524us-gaap_NotesAndLoansReceivableNetNoncurrent $ 28us-gaap_NotesAndLoansReceivableNetNoncurrent