Note 7 - Investments in Marketable Securities (Tables)

9 Months Ended

Jun. 30, 2021

Notes Tables

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

	June 30, 2021						September 30, 2020
	Aggregate fair value		Adjusted cost basis		Pretax unrealized gains		Aggregate fair value		Adjusted cost basis		Pretax unrealized gains
Marketable securities
Common stocks	$	349,593,000	$	80,246,000	$	269,347,000	$	179,368,000	$	41,775,000	$	137,593,000