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Note 11 - Summary of Securities (Details) - USD ($) $ in Thousands	Jun. 24, 2017	Sep. 24, 2016
Held-to-maturity securities, fair market value	$ 116,232	$ 104,878
Available-for-sale securities, amortized cost	29,794	29,794
Available-for-sale securities, gross unrealized gains	662	273
Available-for-sale securities, gross unrealized losses	292	602
Available-for-sale securities, fair market value	30,164	29,465
Held-to-maturity securities, amortized cost	115,970	104,271
Held-to-maturity securities, gross unrealized gains	428	745
Held-to-maturity securities, gross unrealized losses	166	138
Corporate Bond Securities [Member]
Held-to-maturity securities, fair market value	114,311	103,907
Held-to-maturity securities, amortized cost	114,050	103,311
Held-to-maturity securities, gross unrealized gains	425	734
Held-to-maturity securities, gross unrealized losses	164	138
Mutual Funds [Member]
Available-for-sale securities, amortized cost	13,003	13,003
Available-for-sale securities, gross unrealized gains	34	0
Available-for-sale securities, gross unrealized losses	242	520
Available-for-sale securities, fair market value	12,795	12,483
Certificates of Deposit [Member]
Held-to-maturity securities, fair market value	1,921	971
Held-to-maturity securities, amortized cost	1,920	960
Held-to-maturity securities, gross unrealized gains	3	11
Held-to-maturity securities, gross unrealized losses	2	0
Preferred Stock [Member]
Available-for-sale securities, amortized cost	16,791	16,791
Available-for-sale securities, gross unrealized gains	628	273
Available-for-sale securities, gross unrealized losses	50	82
Available-for-sale securities, fair market value	$ 17,369	$ 16,982

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)
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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)
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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)
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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
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

+ References

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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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