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Note 11 - Summary of Securities (Details) - USD ($)	Mar. 25, 2017	Sep. 24, 2016
Held to Maturity - Amortized Cost	$ 122,288,000	$ 104,271,000
Held to Maturity - Gross Unrealized Gains	310,000	745,000
Held to Maturity - Gross Unrealized Losses	225,000	138,000
Held to Maturity - Fair Market Value	122,373,000	104,878,000
Available for Sale - Amortized Cost	29,794,000	29,794,000
Available for Sale - Gross Unrealized Gains	502,000	273,000
Available for Sale - Gross Unrealized Losses	336,000	602,000
Available for Sale - Fair Market Value	29,960,000	29,465,000
Corporate Bond Securities [Member]
Held to Maturity - Amortized Cost	120,368,000	103,311,000
Held to Maturity - Gross Unrealized Gains	306,000	734,000
Held to Maturity - Gross Unrealized Losses	225,000	138,000
Held to Maturity - Fair Market Value	120,449,000	103,907,000
Mutual Funds [Member]
Available for Sale - Amortized Cost	13,003,000	13,003,000
Available for Sale - Gross Unrealized Gains
Available for Sale - Gross Unrealized Losses	269,000	520,000
Available for Sale - Fair Market Value	12,734,000	12,483,000
Certificates of Deposit [Member]
Held to Maturity - Amortized Cost	1,920,000	960
Held to Maturity - Gross Unrealized Gains	4,000	11
Held to Maturity - Gross Unrealized Losses
Held to Maturity - Fair Market Value	1,924,000	971
Preferred Stock [Member]
Available for Sale - Amortized Cost	16,791,000	16,791,000
Available for Sale - Gross Unrealized Gains	502,000	273,000
Available for Sale - Gross Unrealized Losses	67,000	82,000
Available for Sale - Fair Market Value	$ 17,226,000	$ 16,982,000

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://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=82897076&loc=d3e27161-111563

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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=82897076&loc=d3e27161-111563

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+ 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

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
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Amount of accumulated unrealized gain on 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
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-Section 50
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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