Note 7 - Fair Value Measurement - Fair Value Measurement on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands |
Dec. 25, 2021 |
Sep. 25, 2021 |
Jun. 26, 2021 |
Mar. 27, 2021 |
|---|---|---|---|---|
| Prefunded warrants liability | $ 0 | $ 0 | $ 1,657 | $ 0 |
| Fair Value, Inputs, Level 1 [Member] | ||||
| Prefunded warrants liability | 0 | 0 | 0 | 0 |
| Fair Value, Inputs, Level 2 [Member] | ||||
| Prefunded warrants liability | 0 | 0 | 0 | 0 |
| Fair Value, Inputs, Level 3 [Member] | ||||
| Prefunded warrants liability | $ 0 | $ 0 | $ 1,657 | $ 0 |
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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