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Segment Information (Detail) - The following table presents certain operating segment information - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sales:      
Product $ 14,638 $ 17,003  
Service 5,278 6,673  
Total sales 19,916 23,676  
Income (loss) from operations (102) 343  
Assets 50,702 45,117 $ 48,707
Capital expenditures 72 189  
Depreciation and amortization 157 161  
High Performance Products Segment      
Sales:      
Product 1,527 1,950  
Service 1,224 867  
Total sales 2,751 2,817  
Income (loss) from operations 46 (423)  
Assets 17,766 16,099  
Capital expenditures 17 148  
Depreciation and amortization 55 57  
Germany      
Sales:      
Product 2,080 1,902  
Service 3,059 4,772  
Total sales 5,139 6,674  
Income (loss) from operations (102) 463  
Assets 15,532 12,977  
Capital expenditures 44 67  
Depreciation and amortization 38 40  
United Kingdom      
Sales:      
Product 701 1,993  
Service 104 190  
Total sales 805 2,183  
Income (loss) from operations (206) (47)  
Assets 2,873 2,810  
Capital expenditures 0 2  
Depreciation and amortization 3 5  
U.S.      
Sales:      
Product 10,330 11,158  
Service 891 844  
Total sales 11,221 12,002  
Income (loss) from operations 160 350  
Assets 14,531 13,231  
Capital expenditures 11 (28)  
Depreciation and amortization 61 59  
Total      
Sales:      
Product 13,111 15,053  
Service 4,054 5,806  
Total sales 17,165 20,859  
Income (loss) from operations (148) 766  
Assets 32,936 29,018  
Capital expenditures 55 41  
Depreciation and amortization $ 102 $ 104