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Segment Information (Detail) - The following table presents certain operating segment information - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Sales:      
Product $ 17,003 $ 15,653  
Service 6,673 4,777  
Total sales 23,676 20,430  
Income (loss) from operations 343 (921)  
Assets 45,117 47,789 $ 46,996
Capital expenditures 189 103  
Depreciation and amortization 161 172  
High Performance Products Segment      
Sales:      
Product 1,950 2,452  
Service 867 230  
Total sales 2,817 2,682  
Income (loss) from operations (423) (857)  
Assets 16,099 15,850  
Capital expenditures 148 21  
Depreciation and amortization 57 71  
Germany      
Sales:      
Product 1,902 2,144  
Service 4,772 3,528  
Total sales 6,674 5,672  
Income (loss) from operations 463 79  
Assets 12,977 12,861  
Capital expenditures 67 81  
Depreciation and amortization 40 47  
United Kingdom      
Sales:      
Product 1,993 1,570  
Service 190 283  
Total sales 2,183 1,853  
Income (loss) from operations (47) 68  
Assets 2,810 3,770  
Capital expenditures 2 1  
Depreciation and amortization 5 7  
U.S.      
Sales:      
Product 11,158 9,487  
Service 844 736  
Total sales 12,002 10,223  
Income (loss) from operations 350 (211)  
Assets 13,231 15,308  
Capital expenditures (28) 0  
Depreciation and amortization 59 47  
Total      
Sales:      
Product 15,053 13,201  
Service 5,806 4,547  
Total sales 20,859 17,748  
Income (loss) from operations 766 (64)  
Assets 29,018 31,939  
Capital expenditures 41 82  
Depreciation and amortization $ 104 $ 101