Note 3 - Deferred Income Taxes (Details) - USD ($)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Deferred tax assets attributable to:
Accrued liabilities, including supplemental compensation and vacation pay accrual	$ 605,000	$ 1,063,000	$ 1,083,000
Impairment losses on investments	1,369,000	1,779,000	1,778,000
Bad debt reserves not yet deductible	82,000	78,000	78,000
Depreciation and amortization	3,251,000	1,822,000	356,000
Deferred revenues	(1,378,000)	(1,116,000)
Credits and other	869,000	12,000	41,000
Total deferred tax assets	7,554,000	5,870,000	3,336,000
Deferred tax liabilities attributable to:
Unrealized gains on investments	(43,278,000)	(48,896,000)	(34,610,000)
Goodwill	(896,000)	(495,000)
Total deferred tax liabilities	(44,174,000)	(49,391,000)	(34,610,000)
Net deferred income taxes	$ (36,620,000)	$ (43,521,000)	$ (31,274,000)