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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | [1] | Sep. 30, 2017 | [1]
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax amount | $ 2,341 | $ 809 | $ 3,249
State taxes, net of federal benefits | 196 | (71) | 124
Manufacturing deduction | 0 | (364) | (150)
Transaction costs | 0 | 79 | 0
Employee stock purchase plan | 59 | 56 | 79
Foreign operations | 225 | 318 | (142)
Non-deductible executive compensation | 171 | 27 | 0
Change in valuation allowance | 520 | (994) | 77
Utilization of research and development tax credits | (2,112) | (1,971) | (1,405)
One-time transition tax | 0 | 250 | 0
Deferred balance sheet remeasure | 9 | 2,727 | 0
ASU 2016-09 excess stock compensation | (56) | 643 | 0
Contingent consideration | 250 | 388 | (1,172)
Changes from provision to return | (511) | (554) | (196)
Adjustment of tax contingency reserves | 146 | 193 | (370)
Other, net | (51) | 83 | 53
Income tax provision | $ 1,187 | $ 1,619 | $ 147
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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