Note 7 - Investments in Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2021

Notes Tables

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

	December 31, 2021						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	$	395,284,000	$	187,279,000	$	208,005,000	$	347,573,000	$	103,480,000	$	244,093,000