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Segment and Geographic Information Segment and Geographic Information (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Segment Reporting Information [Line Items]      
Disclosure on geographic areas, revenues from foreign external customers attributed to entity's country of domicile $ 7,000,000 $ 6,000,000 $ 4,561,119
U.S. 38,438,064 33,421,745 33,220,925
Foreign 11,214,302 13,760,491 15,460,197
Total 49,652,366 47,182,236 48,681,122
U.S. 3,050,983 3,295,430 3,402,956
Foreign 991,192 1,044,707 1,220,821
Total $ 4,042,175 $ 4,340,137 $ 4,623,777