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Segment Information and Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
customer
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
customer
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
customer
segment
Sep. 30, 2012
customer
Sep. 30, 2011
customer
Segment Reporting Information [Line Items]                      
Number of operating segments                 1    
Number of reportable segments                 1    
Total revenue $ 51,369 $ 48,824 $ 48,197 $ 46,991 $ 47,248 $ 47,632 $ 49,016 $ 46,662 $ 195,381 $ 190,558 $ 204,160
Total property, equipment and improvements 13,910       15,157       13,910 15,157 15,370
Number of customer representing over ten percent of revenue                 0 0 0
Number of customer representing over ten percent of consolidated accounts receivable 1       0       1 0 0
Single customer representing over ten percent of consolidated accounts receivable, percent 13.80%               13.80%    
North America, primarily United States
                     
Segment Reporting Information [Line Items]                      
Total revenue                 116,541 112,398 118,654
United States
                     
Segment Reporting Information [Line Items]                      
Total property, equipment and improvements 13,321       14,233       13,321 14,233 14,169
United States | U.S. Export Net Sales
                     
Segment Reporting Information [Line Items]                      
Percentage of revenue                 41.70% 39.60% 37.50%
Europe, Middle East and Africa
                     
Segment Reporting Information [Line Items]                      
Total revenue                 48,815 47,042 52,125
Asia
                     
Segment Reporting Information [Line Items]                      
Total revenue                 24,507 24,844 26,939
Latin America
                     
Segment Reporting Information [Line Items]                      
Total revenue                 5,518 6,274 6,442
International, primarily Europe
                     
Segment Reporting Information [Line Items]                      
Total property, equipment and improvements 589       924       589 924 1,201
Growth hardware product and all services
                     
Segment Reporting Information [Line Items]                      
Total revenue                 110,741 99,257 101,565
Mature hardware products
                     
Segment Reporting Information [Line Items]                      
Total revenue                 $ 84,640 $ 91,301 $ 102,595