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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Sales:          
Product $ 18,684 $ 20,972 $ 33,322 $ 37,975  
Service 6,632 6,167 11,910 12,840  
Total sales 25,316 27,139 45,232 50,815  
Income (loss) from operations 622 878 520 1,221  
Assets 53,197 48,248 53,197 48,248 $ 48,707
Capital expenditures 106 155 178 345  
Depreciation and amortization 172 191 329 351  
High Performance Products Segment          
Sales:          
Product 1,993 2,861 3,520 4,811  
Service 1,427 597 2,651 1,464  
Total sales 3,420 3,458 6,171 6,275  
Income (loss) from operations 368 (501) 414 (924)  
Assets 16,667 15,353 16,667 15,353  
Capital expenditures 41 17 58 165  
Depreciation and amortization 55 60 110 117  
Germany          
Sales:          
Product 2,319 1,389 4,399 3,291  
Service 4,069 4,027 7,128 8,799  
Total sales 6,388 5,416 11,527 12,090  
Income (loss) from operations 261 718 158 1,181  
Assets 17,513 12,311 17,513 12,311  
Capital expenditures 43 52 87 119  
Depreciation and amortization 53 42 91 82  
United Kingdom          
Sales:          
Product 2,162 1,352 2,863 3,345  
Service 209 262 313 452  
Total sales 2,371 1,614 3,176 3,797  
Income (loss) from operations (35) (1) (241) (48)  
Assets 2,864 2,791 2,864 2,791  
Capital expenditures 0 31 0 33  
Depreciation and amortization 2 33 5 38  
U.S.          
Sales:          
Product 12,210 15,370 22,540 26,528  
Service 927 1,281 1,818 2,125  
Total sales 13,137 16,651 24,358 28,653  
Income (loss) from operations 28 662 189 1,012  
Assets 16,153 17,793 16,153 17,793  
Capital expenditures 22 55 33 28  
Depreciation and amortization 62 56 123 114  
Total          
Sales:          
Product 16,691 18,111 29,802 33,164  
Service 5,205 5,570 9,259 11,376  
Total sales 21,896 23,681 39,061 44,540  
Income (loss) from operations 254 1,379 106 2,145  
Assets 36,530 32,895 36,530 32,895  
Capital expenditures 65 138 120 180  
Depreciation and amortization $ 117 $ 131 $ 219 $ 234