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Note 3 - Income Taxes - Deferred Income Taxes (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Deferred tax assets attributable to:
Accrued liabilities, including supplemental compensation and vacation pay accrual	$ 1,603,000	$ 415,000
Impairment losses on marketable securities	113,000	1,016,000
Bad debt reserves not yet deductible	55,000	55,000
Depreciation and amortization	3,065,000	3,482,000
Deferred revenues	1,836,000	913,000
Goodwill	520,000	590,000
Net operating losses	561,000	4,768,000
Credits and other	268,000	432,000
Total deferred tax assets	8,021,000	11,671,000
Deferred tax liabilities attributable to:
Unrealized gains on marketable securities	(64,115,000)	(35,870,000)
Net deferred income taxes	$ (56,094,000)	$ (24,199,000)

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