Note 6 - Investments in Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2019

Notes Tables

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

	Investments in Marketable Securities
	December 31, 2019						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	$	214,112,000	$	53,889,000	$	160,223,000	$	194,581,000	$	53,889,000	$	140,692,000