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Note 3 - Income Taxes - Deferred Income Taxes (Details) - USD ($) | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Accrued liabilities, including supplemental compensation and vacation pay accrual | $ (106,000) | $ (69,000)
Impairment losses on investments | 2,215,000 | 1,376,000
Bad debt reserves not yet deductible | 42,000 | 62,000
Depreciation and amortization | 4,446,000 | 5,977,000
Deferred revenues | 745,000 | 1,431,000
Net operating losses | 4,643,000 | 3,100,000
Credits and other | 455,000 | 1,303,000
Total deferred tax assets | 12,440,000 | 13,180,000
Unrealized gains on investments | (42,151,000) | (64,550,000)
Goodwill | (290,000) | (311,000)
Total deferred tax liabilities | (42,441,000) | (64,861,000)
Net deferred income taxes | $ (30,001,000) | $ (51,681,000)

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