Note 11 - Leases (Details Textual) - USD ($)  | 
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Oct. 02, 2022  | 
Sep. 26, 2021  | 
Oct. 02, 2022  | 
Sep. 26, 2021  | 
|
| Operating Lease, Payments | $ 488,000 | $ 487,000 | $ 968,000 | $ 984,000 | 
| Operating Lease, Weighted Average Remaining Lease Term (Year) | 1 year 7 months 6 days | 1 year 7 months 6 days | ||
| Operating Lease, Weighted Average Discount Rate, Percent | 3.60% | 3.60% | ||
| X | ||||||||||
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
  |