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Segment Information (Detail) - The following table presents certain operating segment information. - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sales:    
Product $ 84,675 $ 77,835
Service 26,807 25,532
Total sales 111,482 103,367
Profit (loss) from operations 3,772 3,801
Assets 58,928 48,707
Capital Expenditures Incurred but Not yet Paid 358 735
Depreciation, Depletion and Amortization, Nonproduction 673 699
Systems Segment [Member]    
Sales:    
Product 7,608 11,190
Service 6,236 5,152
Total sales 13,844 16,342
Profit (loss) from operations 1,467 1,464
Assets 17,782 17,717
Capital Expenditures Incurred but Not yet Paid 99 227
Depreciation, Depletion and Amortization, Nonproduction 224 232
Germany [Member]    
Sales:    
Product 8,322 4,863
Service 14,668 15,130
Total sales 22,990 19,993
Profit (loss) from operations 377 676
Assets 17,055 13,751
Capital Expenditures Incurred but Not yet Paid 151 322
Depreciation, Depletion and Amortization, Nonproduction 188 158
UK [Member]    
Sales:    
Product 10,727 7,066
Service 763 925
Total sales 11,490 7,991
Profit (loss) from operations (30) (363)
Assets 6,878 3,748
Capital Expenditures Incurred but Not yet Paid 0 97
Depreciation, Depletion and Amortization, Nonproduction 9 79
US [Member]    
Sales:    
Product 58,018 54,716
Service 5,140 4,325
Total sales 63,158 59,041
Profit (loss) from operations 1,958 2,024
Assets 17,213 13,491
Capital Expenditures Incurred but Not yet Paid 108 89
Depreciation, Depletion and Amortization, Nonproduction 252 230
Total Service And System Integration Segment [Member]    
Sales:    
Product 77,067 66,645
Service 20,571 20,380
Total sales 97,638 87,025
Profit (loss) from operations 2,305 2,337
Assets 41,146 30,990
Capital Expenditures Incurred but Not yet Paid 259 508
Depreciation, Depletion and Amortization, Nonproduction $ 449 $ 467