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Note C - Investment Securities (Details Textual) - USD ($) | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Proceeds from Sale and Maturity of Marketable Securities, Total | $ 39,158,000 | $ 75,302,000 | $ 22,997,000
Marketable Securities, Gain (Loss), Total | 27,000 | $ (140,000) | $ 14,000
Marketable Securities, Unrealized Gain (Loss), Total | $ (431,000) |  |
Mutual Fund [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 4.50% |  |
Preferred Stock [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 5.40% |  |
Marketable Securities, Total | $ 15,000,000 |  |
Marketable Securities, Annual Income, Percentage, not Subject to Tax | 50.00% |  |
Corporate Bond Securities [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 2.80% |  |
Marketable Securities, Total | $ 128,000,000 |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost | $ 115,000,000 |  |

X
- Definition The annual income percentage generated by debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References No definition available. + Details
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- Definition The percentage of annual income percentage from debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that is not subject to tax. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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