Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Apr. 30, 2021 |
Apr. 30, 2020 |
|
Stock issuance costs | $ 239 | $ 123 |
At-the-market Sales Agreement [Member] | ||
Stock issuance costs | $ 132 |