Note 2 - Significant Accounting Policies - Tax Returns Subject to Examination (Details) |
12 Months Ended |
|---|---|
Mar. 31, 2022 | |
| Domestic Tax Authority [Member] | |
| Open tax year | 2019 2020 2021 2022 |
| State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] | |
| Open tax year | 2018 2019 2020 2021 2022 |