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Note 16 - Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Current income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (45,468 | ) |  | $ | 227 |  |  | $ | (45 | )
State |  |  | 1,439 |  |  |  | 1,602 |  |  |  | 1,672 |
Foreign |  |  | 12,265 |  |  |  | 11,150 |  |  |  | 8,549 |
Total current income tax expense |  |  | (31,764 | ) |  |  | 12,979 |  |  |  | 10,176 |
Deferred income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 291 |  |  |  | (4,773 | ) |  |  | (18,737 | )
State |  |  | 59 |  |  |  | 1,318 |  |  |  | (390 | )
Foreign |  |  | (187 | ) |  |  | (4,283 | ) |  |  | (3,014 | )
Total deferred income tax expense (benefit) |  |  | 163 |  |  |  | (7,738 | ) |  |  | (22,141 | )
Income tax expense (benefit) |  | $ | (31,601 | ) |  | $ | 5,241 |  |  | $ | (11,965 | )
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Domestic |  | $ | (33,676 | ) |  | $ | (39,648 | ) |  | $ | (53,400 | )
Foreign |  |  | 26,533 |  |  |  | 20,523 |  |  |  | 33,395 |
Loss from continuing operations before income taxes |  | $ | (7,143 | ) |  | $ | (19,125 | ) |  | $ | (20,005 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Income tax benefit computed at federal statutory rate |  | $ | (1,500 | ) |  | $ | (3,945 | ) |  | $ | (4,129 | )
State income taxes, net of federal benefit |  |  | (593 | ) |  |  | (598 | ) |  |  | (696 | )
Foreign income taxed at different rates |  |  | 953 |  |  |  | (3,521 | ) |  |  | 1,477 |
Worthless stock deduction |  |  | (45,600 | ) |  |  | — |  |  |  | — |
Impact of investments in subsidiaries |  |  | (23,348 | ) |  |  | (22,583 | ) |  |  | (6,059 | )
Change in deferred tax asset valuation allowance |  |  | 36,475 |  |  |  | 31,793 |  |  |  | (7 | )
Impact of change in uncertain tax positions |  |  | (398 | ) |  |  | 36 |  |  |  | (1,321 | )
Global intangible low taxed income, net of foreign tax credits |  |  | 4,914 |  |  |  | 3,767 |  |  |  | 310 |
Impact of tax rate changes |  |  | (928 | ) |  |  | (46 | ) |  |  | (1,391 | )
Compensation |  |  | 1,353 |  |  |  | 1,413 |  |  |  | 1,484 |
Tax credits |  |  | (1,538 | ) |  |  | (1,199 | ) |  |  | (1,425 | )
Other non-deductible expenses and other taxes |  |  | (111 | ) |  |  | 1,461 |  |  |  | 1,069 |
Research and development expense deduction |  |  | (1,280 | ) |  |  | (1,337 | ) |  |  | (1,277 | )
Income tax (benefit) expense |  | $ | (31,601 | ) |  | $ | 5,241 |  |  | $ | (11,965 | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | September 30, |
|  | 2025 |  |  | 2024 |
Accruals and reserves not currently deductible |  | $ | 9,137 |  |  | $ | 10,291 |
Federal, state and foreign tax credits |  |  | 2,326 |  |  |  | 1,151 |
Other assets |  |  | 2,894 |  |  |  | 1,213 |
Equity compensation |  |  | 3,776 |  |  |  | 2,359 |
Loss carryforwards |  |  | 86,724 |  |  |  | 44,356 |
Lease liabilities |  |  | 14,789 |  |  |  | 16,283 |
Capitalized research and development |  |  | 7,035 |  |  |  | 6,253 |
Deferred revenue |  |  | 2,954 |  |  |  | 3,573 |
Net unrealized loss on hedging and investments |  |  | 8,241 |  |  |  | 527 |
Deferred tax assets |  |  | 137,876 |  |  |  | 86,006 |
Depreciation and intangible amortization |  |  | (37,019 | ) |  |  | (43,756 | )
Right-of-use assets |  |  | (13,626 | ) |  |  | (15,217 | )
Other liabilities |  |  | (904 | ) |  |  | (605 | )
Outside basis differences in subsidiaries |  |  | (2,149 | ) |  |  | — |
Deferred tax liabilities |  |  | (53,698 | ) |  |  | (59,578 | )
Valuation allowance |  |  | (102,021 | ) |  |  | (44,222 | )
Net deferred tax liability |  | $ | (17,843 | ) |  | $ | (17,794 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | 298 |  |  | $ | 1,679 |  |  | $ | 2,006 |
Additions from current year positions |  |  | 2,500 |  |  |  | — |  |  |  | — |
Reductions from lapses in statutes of limitation |  |  | (298 | ) |  |  | (1,381 | ) |  |  | (327 | )
Balance at end of period |  | $ | 2,500 |  |  | $ | 298 |  |  | $ | 1,679 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + 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://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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