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Note 2 - Summary of Significant Accounting Policies - Investment in Financial Instruments (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Common Stock [Member] |  |
Available-for-sale Securities | $ 158,462,000 | $ 158,705,000
Marketable Securities | 53,436,000 | 49,604,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 105,026,000 | 109,101,000
Fixed Income Securities [Member] |  |
Available-for-sale Securities | 8,172,000 | 7,336,000
Marketable Securities | 4,942,000 | 4,939,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 3,230,000 | 2,397,000
Available-for-sale Securities | 166,634,000 | 166,041,000
Marketable Securities | 58,378,000 | 54,543,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) | $ 108,256,000 | $ 111,498,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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