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Segment Information (Detail) - The following table presents certain operating segment information - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Sales:          
Product $ 20,345 $ 15,696 $ 58,320 $ 45,544  
Service 6,567 6,591 19,407 16,050  
Total sales 26,912 22,287 77,727 61,594  
Income (loss) from operations 1,853 695 3,074 (865)  
Assets 48,399 45,982 48,399 45,982 $ 46,996
Capital expenditures 141 176 486 398  
Depreciation and amortization 191 151 542 482  
High Performance Products Segment          
Sales:          
Product 3,354 1,844 8,165 6,823  
Service 2,248 2,085 3,712 2,445  
Total sales 5,602 3,929 11,877 9,268  
Income (loss) from operations 1,585 871 661 (633)  
Assets 17,486 16,034 17,486 16,034  
Capital expenditures 28 4 193 50  
Depreciation and amortization 59 56 176 187  
Germany          
Sales:          
Product 1,074 1,289 4,365 5,229  
Service 2,892 3,535 11,691 10,753  
Total sales 3,966 4,824 16,056 15,982  
Income (loss) from operations (139) 196 1,042 445  
Assets 13,306 12,854 13,306 12,854  
Capital expenditures 30 30 149 205  
Depreciation and amortization 36 39 118 130  
United Kingdom          
Sales:          
Product 1,805 601 5,150 3,062  
Service 325 377 777 873  
Total sales 2,130 978 5,927 3,935  
Income (loss) from operations (10) (558) (58) (583)  
Assets 2,641 2,955 2,641 2,955  
Capital expenditures 60 0 93 1  
Depreciation and amortization 39 10 77 27  
U.S.          
Sales:          
Product 14,112 11,962 40,640 30,430  
Service 1,102 594 3,227 1,979  
Total sales 15,214 12,556 43,867 32,409  
Income (loss) from operations 417 186 1,429 (94)  
Assets 14,966 14,139 14,966 14,139  
Capital expenditures 23 142 51 142  
Depreciation and amortization 57 46 171 138  
Total          
Sales:          
Product 16,991 13,852 50,155 38,721  
Service 4,319 4,506 15,695 13,605  
Total sales 21,310 18,358 65,850 52,326  
Income (loss) from operations 268 (176) 2,413 (232)  
Assets 30,913 29,948 30,913 29,948  
Capital expenditures 113 172 293 348  
Depreciation and amortization $ 132 $ 95 $ 366 $ 295