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Note 3 - Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Accrued liabilities, including supplemental compensation and vacation pay accrual | $ 1,903 | $ 1,990
Impairment losses on marketable securities | (280) | (306)
Bad debt reserves not yet deductible | 55 | 55
Depreciation and amortization | 1,730 | 2,206
Deferred revenues | 517 | 1,068
Goodwill | 265 | 370
Net operating losses | 166 | 281
Credits and other | 103 | (3)
Total deferred tax assets | 4,459 | 5,661
Unrealized gains on marketable securities | 57,100 | 36,260
Net deferred income taxes | $ 52,641 | $ 30,599

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from accrued liabilities including supplemental compensation and vacation pay accrual. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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