Note 8 - Share-based Compensation Plans - Annualized Weighted Average Values of Significant Assumptions Used to Estimate Fair Values (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 27, 2025 |
Dec. 28, 2024 |
Dec. 28, 2024 |
Dec. 28, 2024 |
Dec. 28, 2024 |
|
| Risk-free interest rate, Minimum (Rate) | 4.16% | ||||
| Risk-free interest rate, Maximum | 4.33% | 4.16% | 4.33% | ||
| Expected volatility | 56.70% | 61.20% | |||
| Expected dividend yield | 0.00% | 0.00% | |||
| Weighted average fair value of grants (in dollars per share) | $ 0.92 | $ 2.29 | |||
| Minimum [Member] | |||||
| Expected life in years (Year) | 5 years 2 months 12 days | 5 years | |||
| Maximum [Member] | |||||
| Expected life in years (Year) | 7 years | 7 years 7 months 6 days | |||