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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax amount | $ 3,912 | $ 1,890 | $ 1,567
State taxes, net of federal benefits | 85 | 319 | 392
Transaction costs | 2 | 60 | 143
Employee stock purchase plan | 98 | 79 | 127
Foreign operations | 1,552 | 556 | 431
Non-deductible executive compensation | 291 | 150 | 115
Change in valuation allowance | 0 | (2,187) | 173
Utilization of research and development tax credits | (2,780) | (3,116) | (2,881)
Deferred balance sheet remeasure | 0 | (952) | 0
ASU 2016-09 excess stock compensation | (2,967) | (1,131) | (673)
Contingent consideration | (1,239) | 1,212 | (27)
Changes from provision to return | 413 | (458) | (111)
Adjustment of tax contingency reserves | 417 | 329 | 151
U.S. deduction for foreign export sales | (584) | (630) | (355)
Global intangible low-taxed income | 0 | 33 | 31
Other, net | 45 | 178 | (31)
Income tax (benefit) expense | (755) | (1,367) | (948)
Effective Income Tax Rate Reconciliation, Capital Loss Expiration | $ 0 | $ 2,301 | $ 0

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