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Segment Information (Detail) - The following table presents certain operating segment information - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Sales:          
Product $ 15,184 $ 18,684 $ 30,827 $ 33,322  
Service 6,798 6,632 13,154 11,910  
Total sales 21,982 25,316 43,981 45,232  
Income (loss) from operations (723) 622 (716) 520  
Assets 55,338 53,197 55,338 53,197 $ 58,928
Capital expenditures 196 106 305 178  
Depreciation and amortization 162 172 333 329  
High Performance Products Segment          
Sales:          
Product 1,480 1,993 3,087 3,520  
Service 315 1,427 1,178 2,651  
Total sales 1,795 3,420 4,265 6,171  
Income (loss) from operations (1,057) 368 (1,440) 414  
Assets 15,036 16,667 15,036 16,667  
Capital expenditures 36 41 46 58  
Depreciation and amortization 57 55 113 110  
Germany          
Sales:          
Product 1,135 2,319 3,109 4,399  
Service 4,243 4,069 7,638 7,128  
Total sales 5,378 6,388 10,747 11,527  
Income (loss) from operations 140 261 (17) 158  
Assets 21,172 17,513 21,172 17,513  
Capital expenditures 64 43 129 87  
Depreciation and amortization 35 53 82 91  
United Kingdom          
Sales:          
Product 756 2,162 3,298 2,863  
Service 115 209 280 313  
Total sales 871 2,371 3,578 3,176  
Income (loss) from operations (233) (35) (91) (241)  
Assets 2,792 2,864 2,792 2,864  
Capital expenditures 0 0 0 0  
Depreciation and amortization 1 2 2 5  
U.S.          
Sales:          
Product 11,813 12,210 21,333 22,540  
Service 2,125 927 4,058 1,818  
Total sales 13,938 13,137 25,391 24,358  
Income (loss) from operations 427 28 832 189  
Assets 16,338 16,153 16,338 16,153  
Capital expenditures 96 22 130 33  
Depreciation and amortization 69 62 136 123  
Total          
Sales:          
Product 13,704 16,691 27,740 29,802  
Service 6,483 5,205 11,976 9,259  
Total sales 20,187 21,896 39,716 39,061  
Income (loss) from operations 334 254 724 106  
Assets 40,302 36,530 40,302 36,530  
Capital expenditures 160 65 259 120  
Depreciation and amortization $ 105 $ 117 $ 220 $ 219