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Note C - Investment Securities - Summary of Held to Maturity Securities (Details) - USD ($) | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
--- | --- | --- | ---
Corporate Bond Securities [Member] |  |  |
Amortized Cost | $ 103,311,000 | $ 66,660,000 |
Gross Unrealized Gains | 734,000 | 15,000 |
Gross Unrealized Losses | 138,000 | 663,000 |
Fair Market Value | 103,907,000 | 66,012,000 |
Mutual Fund [Member] |  |  |
Amortized Cost | 13,003,000 | 20,041,000 |
Gross Unrealized Gains |  |  |
Gross Unrealized Losses | 520,000 | 827,000 |
Available-for-sale Securities | 12,483,000 | 19,214,000 | $ 128,000,000
Certificates of Deposit [Member] |  |  |
Amortized Cost | 960,000 |  |
Gross Unrealized Gains | 11,000 |  |
Gross Unrealized Losses |  |  |
Fair Market Value | 971,000 |  |
Preferred Stock [Member] |  |  |
Amortized Cost | 16,791,000 | 20,473,000 |
Gross Unrealized Gains | 273,000 | 114,000 |
Gross Unrealized Losses | 82,000 | 163,000 |
Available-for-sale Securities | 16,982,000 | 20,424,000 |
Amortized Cost | 104,271,000 | 66,660,000 |
Gross Unrealized Gains | 745,000 | 15,000 |
Gross Unrealized Losses | 138,000 | 663,000 |
Fair Market Value | 104,878,000 | 66,012,000 |
Amortized Cost | 29,794,000 | 40,514,000 |
Gross Unrealized Gains | 273,000 | 114,000 |
Gross Unrealized Losses | 602,000 | 990,000 |
Available-for-sale Securities | $ 29,465,000 | $ 39,638,000 |

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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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