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Note 6 - Investments in Marketable Securities - Summary of Investments (Details) - USD ($)	Mar. 31, 2018	Sep. 30, 2017
Aggregate fair value	$ 217,803,000	$ 229,265,000
Amortized/Adjusted cost basis	58,449,000	63,393,000
Pretax unrealized gains	159,354,000	165,872,000
Common Stock [Member]
Aggregate fair value	217,803,000	220,973,000
Amortized/Adjusted cost basis	58,449,000	58,449,000
Pretax unrealized gains	159,354,000	162,524,000
Bonds [Member]
Aggregate fair value		8,292,000
Amortized/Adjusted cost basis		4,944,000
Pretax unrealized gains		$ 3,348,000

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
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X

- Details

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