Note 7 - Fair Value Measurement (Details Textual) $ in Thousands |
Jun. 26, 2021
USD ($)
|
Apr. 27, 2021 |
Mar. 27, 2021
USD ($)
|
|---|---|---|---|
| Fair Value, Recurring [Member] | |||
| Assets, Fair Value Disclosure | $ 0 | $ 0 | |
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | ||
| Fair Value, Nonrecurring [Member] | |||
| Assets, Fair Value Disclosure | $ 0 | 0 | |
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | ||
| Measurement Input, Exercise Price [Member] | Prefunded Warrants [Member] | |||
| Derivative Liability, Measurement Input | 0.01 |
| X | ||||||||||
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Value of input used to measure derivative liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Fair value of financial and nonfinancial obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|