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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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