Note F - Cash, Cash Equivalents And Marketable Securities (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | 18 Months Ended | ||
|---|---|---|---|---|---|
Jul. 05, 2026 |
Jun. 29, 2025 |
Jul. 05, 2026 |
Jun. 29, 2025 |
Jun. 29, 2026 |
|
| Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | $ 6,000 | $ 1,486,000 | $ 6,000 | $ 1,983,000 | |
| Debt Securities, Available-for-Sale, Realized Gain (Loss) | 0 | 0 | 0 | 0 | |
| OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax | 2,000 | 12,000 | 4,000 | $ 29,000 | |
| Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 496,000 | 496,000 | |||
| AOCI Attributable to Parent [Member] | |||||
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | $ 0 | $ 0 | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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