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Note 2 - Summary of Significant Accounting Policies - Investment in Financial Instruments (Details) - USD ($) | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Marketable securities, fair value | $ 212,296,000 | $ 229,265,000
Marketable securities, amortized cost | 53,889,000 | 63,393,000
Marketable securities, gross unrealized gains | 158,407,000 | 165,872,000
Common Stock [Member] |  |
Marketable securities, fair value | 212,296,000 | 220,973,000
Marketable securities, amortized cost | 53,889,000 | 58,449,000
Marketable securities, gross unrealized gains | 158,407,000 | 162,524,000
Fixed Income Securities [Member] |  |
Marketable securities, fair value |  | 8,292,000
Marketable securities, amortized cost |  | 4,944,000
Marketable securities, gross 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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- Details
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- Details
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