Note 6 - Investments in Marketable Securities (Tables)

9 Months Ended

Jun. 30, 2020

Notes Tables

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

	June 30, 2020						September 30, 2019
	Aggregate fair value		Adjusted cost basis		Pretax net unrealized gains		Aggregate fair value		Amortized/ Adjusted cost basis		Pretax unrealized gains
Marketable securities
Common stocks	$	153,390,000	$	53,889,000	$	99,501,000	$	194,581,000	$	53,889,000	$	140,692,000