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Income Taxes (Detail) - Reconciliation of “expected” income tax expense (benefit) to “actual” income tax expense (benefit) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]    
Computed “expected” tax expense (in Dollars) $ 1,289 $ 1,224
Computed “expected” tax expense 34.00% 34.00%
Increases (reductions) in taxes resulting from:    
State income taxes, net of federal tax benefit (in Dollars) $ 80 $ 124
State income taxes, net of federal tax benefit 2.10% 3.50%
Foreign operations (in Dollars) $ 11 $ 67
Foreign operations 0.30% 1.90%
Permanent differences (in Dollars) $ (4) $ (20)
Permanent differences (0.10%) (0.60%)
Change in valuation allowance (in Dollars) $ (37) $ 0
Change in valuation allowance (1.00%) 0.00%
Uncertain tax liability adjustment (in Dollars) $ 8 $ 8
Uncertain tax liability adjustment 0.20% 0.20%
Research & Development Credit (in Dollars) $ (53) $ (344)
Research & Development Credit (1.40%) (9.60%)
Other items (in Dollars) $ (7) $ (63)
Other items (0.20%) (1.70%)
Income tax expense (benefit) $ 1,287 $ 996
Income tax expense 33.90% 27.70%