Note 7 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details) - USD ($) |
6 Months Ended | |
|---|---|---|
Sep. 29, 2019 |
Sep. 30, 2018 |
|
| Performance Bonus Plan [Member] | ||
| Shares Vested (in shares) | 21,125 | 41,726 |
| Shares Vested, Aggregate Value | $ 109,000 | $ 246,000 |
| Shares Vested, Taxes Remitted | $ 17,000 | $ 95,000 |
| Performance Shares [Member] | ||
| Number of Shares (in shares) | 0 | |
| Performance Shares [Member] | Earned in Fiscal Year 2016, Granted in Fiscal Year 2017 [Member] | Performance Bonus Plan [Member] | ||
| Number of Shares (in shares) | 41,205 | |
| Shares Vested (in shares) | 20,601 | |
| Shares Vested, Aggregate Value | $ 122,000 | |
| Shares Vested, Taxes Remitted | $ 39,000 | |
| Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member] | Performance Bonus Plan [Member] | ||
| Number of Shares (in shares) | 42,250 | |
| Shares Vested (in shares) | 21,125 | 21,125 |
| Shares Vested, Aggregate Value | $ 109,000 | $ 124,000 |
| Shares Vested, Taxes Remitted | $ 17,000 | $ 56,000 |
| X | ||||||||||
- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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