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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2020
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Provision (Benefit) | The components of the income tax provision (benefit) were as follows (in thousands):
| Year Ended September 30,
| 2020 |  | 2019 |  | 2018
Current: |  |  |  |  |
Federal | $ | 945 |  |  | $ | 1,350 |  |  | $ | 973 |
State | 1,186 |  |  | 186 |  |  | 201 |
Foreign | 66 |  |  | 88 |  |  | 449 |
| 2,197 |  |  | 1,624 |  |  | 1,623 |
Deferred: |  |  |  |  |
Federal | 1,045 |  |  | 366 |  |  | (1,834) |
State | (91) |  |  | 457 |  |  | (247) |
Foreign | 519 |  |  | (3) |  |  | (89) |
| 1,473 |  |  | 820 |  |  | (2,170) |
Total income tax provision (benefit) | $ | 3,670 |  |  | $ | 2,444 |  |  | $ | (547) |
Schedule of Income (Loss) Before Income Taxes | Income (loss) before income taxes was as follows (in thousands):
| Year Ended September 30,
| 2020 |  | 2019 |  | 2018
U.S. | $ | 21,243 |  |  | $ | 11,859 |  |  | $ | (2,103) |
Foreign | (913) |  |  | 475 |  |  | (5,596) |
Income (loss) before income taxes | $ | 20,330 |  |  | $ | 12,334 |  |  | $ | (7,699) |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of the statutory U.S. income tax rate and the effective income tax rate, as computed on earnings before income tax provision in each of the three years presented in the Consolidated Statements of Operations, was as follows:
| Year Ended September 30,
| 2020 |  | 2019 |  | 2018
Statutory rate | 21 | % |  | 21 | % |  | 25 | %
State income taxes, net of federal benefit | 5 |  |  | 4 |  |  | (2) |
Research and development credit | (13) |  |  | (7) |  |  | 9 |
Foreign rate differential | — |  |  | 1 |  |  | 1 |
Foreign withholding | — |  |  | 1 |  |  | (3) |
Valuation allowance | 4 |  |  | (2) |  |  | (20) |
Deferred tax rate differential | — |  |  | — |  |  | (4) |
Other | 1 |  |  | 2 |  |  | 1 |
Effective rate | 18 | % |  | 20 | % |  | 7 | %
Schedule of Deferred Tax Assets and Liabilities | The net deferred income tax asset was comprised of the following (in thousands):
| September 30,
| 2020 |  | 2019
Gross assets | $ | 18,326 |  |  | $ | 18,851 |
Gross liabilities and valuation allowance | (14,682) |  |  | (13,734) |
Net deferred income tax asset | $ | 3,644 |  |  | $ | 5,117 |
The tax effect of temporary differences between U.S. GAAP accounting and federal income tax accounting creating deferred income tax assets and liabilities was as follows (in thousands):
| September 30,
| 2020 |  | 2019
Deferred Tax Assets: |  |  |
Net operating loss | $ | 10,823 |  |  | $ | 10,636 |
Credit carryforwards | 1,490 |  |  | 2,895 |
Deferred compensation | 1,681 |  |  | 1,590 |
Uniform capitalization and inventory | 1,067 |  |  | 983 |
Stock-based compensation | 1,079 |  |  | 744 |
Reserve for accrued employee benefits | 929 |  |  | 752 |
Warranty accrual | 655 |  |  | 682 |
Accrued legal | 112 |  |  | 115 |
Postretirement benefits liability | 111 |  |  | 110 |
Other | 379 |  |  | 344 |
Deferred tax assets | $ | 18,326 |  |  | $ | 18,851 |
Deferred Tax Liabilities: |  |  |
Depreciation and amortization | $ | (5,035) |  |  | $ | (5,138) |
Retention and other | (620) |  |  | (365) |
Deferred tax liabilities | $ | (5,655) |  |  | $ | (5,503) |
Less: valuation allowance | (9,027) |  |  | (8,231) |
Net deferred tax asset | $ | 3,644 |  |  | $ | 5,117 |
Reconciliation of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of the unrecognized tax benefits follows (in thousands):
| Year Ended September 30,
| 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 2,703 |  |  | $ | 1,854 |  |  | $ | 1,219 |
Increases related to tax positions taken during the current period | 220 |  |  | 240 |  |  | 180 |
Increases related to tax positions taken during a prior period | 97 |  |  | 609 |  |  | 455 |
Decreases related to expiration of statute of limitations | (545) |  |  | — |  |  | — |
Decreases related to settlement with taxing authorities | (1,223) |  |  | — |  |  | — |
Balance at end of period | $ | 1,252 |  |  | $ | 2,703 |  |  | $ | 1,854 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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