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Note 3 - Income Taxes - Deferred Income Taxes (Details) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred tax assets attributable to: |  |
Accrued liabilities, including supplemental compensation and vacation pay accrual | $ 415,000 | $ 178,000
Impairment losses on investments | 1,016,000 | 2,201,000
Bad debt reserves not yet deductible | 55,000 | 41,000
Depreciation and amortization | 3,482,000 | 3,999,000
Deferred revenues | 913,000 | 885,000
Goodwill | 590,000 | 677,000
Net operating losses | 4,768,000 | 5,195,000
Credits and other | 432,000 | 456,000
Total deferred tax assets | 11,671,000 | 13,632,000
Deferred tax liabilities attributable to: |  |
Unrealized gains on investments | (35,870,000) | (37,241,000)
Net deferred income taxes | $ (24,199,000) | $ (23,609,000)

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