Note 3 - Marketable Securities - Summary of Unrealized Gains and Losses on Available-for-sale Securities (Details) - USD ($) $ in Thousands |
May 29, 2022 |
Feb. 27, 2022 |
|---|---|---|
| Amortized cost basis | $ 106,964 | $ 100,241 |
| Gross unrealized gains | 6 | 10 |
| Gross unrealized losses | 3,976 | 2,701 |
| US Treasury and Government [Member] | ||
| Amortized cost basis | 76,432 | 65,177 |
| Gross unrealized gains | 5 | 5 |
| Gross unrealized losses | 3,802 | 2,570 |
| Debt Security, Corporate, US [Member] | ||
| Amortized cost basis | 30,532 | 35,064 |
| Gross unrealized gains | 1 | 5 |
| Gross unrealized losses | $ 174 | $ 131 |