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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2022
Accounting Policies [Abstract] |
Cash and Cash Equivalents and Restricted Cash | The reconciliation between the consolidated balance sheet and the consolidated statement of cash flows at April 30 is as follows:
$ in thousands |  | 2022 |  | 2021
Cash and cash equivalents |  | $ | 4,433 |  |  | $ | 5,206 |
Restricted cash |  | 2,461 |  |  | 525 |
Total cash, cash equivalents and restricted cash |  | $ | 6,894 |  |  | $ | 5,731 |
Schedule Of Allowance For Doubtful Accounts | The activity in the allowance for doubtful accounts for each of the years ended April 30 was:
$ in thousands |  | 2022 |  | 2021
Balance at beginning of year |  | $ | 636 |  |  | $ | 606 |
Bad debt provision |  | 92 |  |  | 53 |
Doubtful accounts written off (net) |  | (371) |  |  | (23) |
Balance at end of year |  | $ | 357 |  |  | $ | 636 |
Schedule of Property, Plant and Equipment | Property, plant and equipment consisted of the following at April 30:
$ in thousands |  | 2022 |  | 2021 |  | Useful Life
Land |  | $ | 41 |  |  | $ | 41 |  |  | N/A
Building and improvements |  | 17,164 |  |  | 17,017 |  |  | 10-40 years
Machinery and equipment |  | 43,121 |  |  | 41,746 |  |  | 5-10 years
Total |  | 60,326 |  |  | 58,804 |  |  |
Less accumulated depreciation |  | (45,205) |  |  | (42,822) |  |  |
Net property, plant and equipment |  | $ | 15,121 |  |  | $ | 15,982 |  |  |
Fair Value Hierarchy for Assets and Liabilities | The following tables summarize the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring and nonrecurring basis as of April 30, 2022 and 2021 (in thousands):
| 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets |  |  |  |  |  |  |
Trading securities held in non-qualified compensation plans (1) | $ | 1,219 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,219 |
Cash surrender value of life insurance policies (1) | — |  |  | 1,371 |  |  | — |  |  | 1,371 |
Total | $ | 1,219 |  |  | $ | 1,371 |  |  | $ | — |  |  | $ | 2,590 |
Financial Liabilities |  |  |  |  |  |  |
Non-qualified compensation plans (2) | $ | — |  |  | $ | 3,003 |  |  | $ | — |  |  | $ | 3,003 |
Total | $ | — |  |  | $ | 3,003 |  |  | $ | — |  |  | $ | 3,003 |
| 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets |  |  |  |  |  |  |
Trading securities held in non-qualified compensation plans (1) | $ | 1,299 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,299 |
Cash surrender value of life insurance policies (1) | — |  |  | 1,458 |  |  | — |  |  | 1,458 |
Total | $ | 1,299 |  |  | $ | 1,458 |  |  | $ | — |  |  | $ | 2,757 |
Financial Liabilities |  |  |  |  |  |  |
Non-qualified compensation plans (2) | $ | — |  |  | $ | 3,169 |  |  | $ | — |  |  | $ | 3,169 |
Total | $ | — |  |  | $ | 3,169 |  |  | $ | — |  |  | $ | 3,169 |
(1)The Company maintains two non-qualified compensation plans which include investment assets in a rabbi trust. These assets consist of marketable securities, which are valued using quoted market prices multiplied by the number of shares owned, and life insurance policies, which are valued at their cash surrender value. (2)Plan liabilities are equal to the individual participants' account balances and other earned retirement benefits.
Reconciliation of Basic to Diluted Weighted Average Shares Outstanding | The following is a reconciliation of basic to diluted weighted average common shares outstanding:
Shares in thousands |  | 2022 |  | 2021 |
Weighted average common shares outstanding |  |  |  |  |
Basic |  | 2,786 |  |  | 2,760 |  |
Dilutive effect of stock options and RSUs |  | — |  |  | — |  |
Weighted average common shares outstanding—diluted |  | 2,786 |  |  | 2,760 |  |

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