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Note C - Investment Securities - Summary of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 24, 2016
Held-to-maturity securities, amortized cost	$ 120,021	$ 104,271
Held-to-maturity securities, gross unrealized gains	442	745
Held-to-maturity securities, gross unrealized losses	156	138
Held-to-maturity securities, fair market value	120,307	104,878
Available-for-sale securities, amortized cost	29,794	29,794
Available-for-sale securities, gross unrealized gains	788	273
Available-for-sale securities, gross unrealized losses	322	602
Available-for-sale securities, fair market value	30,260	29,465
Corporate Bond Securities [Member]
Held-to-maturity securities, amortized cost	114,101	103,311
Held-to-maturity securities, gross unrealized gains	424	734
Held-to-maturity securities, gross unrealized losses	155	138
Held-to-maturity securities, fair market value	114,370	103,907
Mutual Funds [Member]
Available-for-sale securities, amortized cost	13,003	13,003
Available-for-sale securities, gross unrealized gains	77	0
Available-for-sale securities, gross unrealized losses	240	520
Available-for-sale securities, fair market value	12,840	12,483
Certificates of Deposit [Member]
Held-to-maturity securities, amortized cost	5,920	960
Held-to-maturity securities, gross unrealized gains	18	11
Held-to-maturity securities, gross unrealized losses	1	0
Held-to-maturity securities, fair market value	5,937	971
Preferred Stock [Member]
Available-for-sale securities, amortized cost	16,791	16,791
Available-for-sale securities, gross unrealized gains	711	273
Available-for-sale securities, gross unrealized losses	82	82
Available-for-sale securities, fair market value	$ 17,420	$ 16,982

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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.

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

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