Note 7 - Investments in Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2022

Notes Tables

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

	March 31, 2022						September 30, 2021
	Aggregate fair value		Adjusted cost basis		Pretax unrealized gains		Aggregate fair value		Adjusted cost basis		Pretax unrealized gains
Marketable securities
Common stocks	$	354,521,000	$	154,837,000	$	199,684,000	$	347,573,000	$	103,480,000	$	244,093,000