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Note 3 - Income Taxes - Deferred Income Taxes (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Deferred tax assets attributable to: |  |
Accrued liabilities, including supplemental compensation and vacation pay accrual | $ 1,792,000 | $ 1,603,000
Impairment losses on marketable securities | (182,000) | (113,000)
Impairment losses on marketable securities | 182,000 | 113,000
Bad debt reserves not yet deductible | 56,000 | 55,000
Depreciation and amortization | 2,686,000 | 3,065,000
Deferred revenues | 1,316,000 | 1,836,000
Goodwill | 451,000 | 520,000
Net operating losses | 657,000 | 561,000
Credits and other | 71,000 | 268,000
Total deferred tax assets | 6,847,000 | 8,021,000
Unrealized gains on marketable securities | (32,120,000) | (64,115,000)
Net deferred income taxes | $ (25,273,000) | $ (56,094,000)

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