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Note 11 - Investment Securities - Held-to-maturity Securities by Contractual Maturity (Details) - USD ($) | Mar. 26, 2022 | Sep. 25, 2021
--- | --- | ---
Due in one year or less, amortized cost | $ 4,530,000 | $ 7,980,000
Due in one year or less, fair market value | 4,473,000 | 8,080,000
Due after one year through five years, amortized cost |  | 4,047,000
Due after one year through five years, fair market value |  | 4,052,000
Total held to maturity securities, amortized cost | 4,530,000 | 12,027,000
Total held to maturity securities, fair market value | 4,473,000 | 12,132,000
Less current portion, amortized cost | 4,530,000 | 7,980,000
Less current portion, fair market value | 4,473,000 | 8,080,000
Long term held to maturity securities, amortized cost | $ 0 | 4,047,000
Long term held to maturity securities, fair market value |  | $ 4,052,000

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