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Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

		September 30, 2018												September 30, 2017
		Aggregate fair value				Amortized/ Adjusted cost basis				Pretax unrealized gains				Aggregate fair value				Amortized/ Adjusted cost basis				Pretax unrealized gains
Marketable securities
Common stocks		$	212,296,000			$	53,889,000			$	158,407,000			$	220,973,000			$	58,449,000			$	162,524,000
Bonds			---				---				---				8,292,000				4,944,000				3,348,000
		$	212,296,000			$	53,889,000			$	158,407,000			$	229,265,000			$	63,393,000			$	165,872,000

Schedule of Finite-Lived Intangible Assets [Table Text Block]

		September 30, 2018												September 30, 2017
		Customer Relationships				Developed Technology				Total				Customer Relationships				Developed Technology				Total
Gross intangible		$	21,950,000			$	2,525,000			$	24,475,000			$	21,950,000			$	2,525,000			$	24,475,000
Accumulated amortization			(21,950,000	)			(2,525,000	)			(24,475,000	)			(19,174,000	)			(2,243,000	)			(21,417,000	)
		$	---			$	---			$	---			$	2,776,000			$	282,000			$	3,058,000

Valuation and Qualifying Accounts [Table Text Block]

Description		Balance at Beginning of Year				Additions Charged to Costs and Expenses				Accounts Charged off less Recoveries				Balance at End of Year
Fiscal 2018
Allowance for doubtful accounts		$	200,000			$	6,000			$	(6,000	)		$	200,000
Fiscal 2017
Allowance for doubtful accounts		$	200,000			$	33,000			$	(33,000	)		$	200,000
Fiscal 2016
Allowance for doubtful accounts		$	250,000			$	5,000			$	(55,000	)		$	200,000

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