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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2019
Accounting Policies [Abstract] |
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 |  | 2019 |  | 2018
Balance at beginning of year |  | $ | 384 |  |  | $ | 191 |
Bad debt provision |  | 65 |  |  | 344 |
Doubtful accounts written off (net) |  | (88 | ) |  | (151 | )
Balance at end of year |  | $ | 361 |  |  | $ | 384 |
Schedule of Property, Plant and Equipment | Property, plant and equipment consisted of the following at April 30:
$ in thousands |  | 2019 |  | 2018 |  | Useful Life
Land |  | $ | 41 |  |  | $ | 41 |  |  | N/A
Building and improvements |  | 16,594 |  |  | 16,489 |  |  | 10-40 years
Machinery and equipment |  | 40,041 |  |  | 38,118 |  |  | 5-10 years
Total |  | 56,676 |  |  | 54,648 |  |  |
Less accumulated depreciation |  | (40,214 | ) |  | (39,987 | ) |  |
Net property, plant and equipment |  | $ | 16,462 |  |  | $ | 14,661 |  |  |
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, 2019 and 2018 (in thousands):
| 2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets |  |  |  |  |  |  |
Trading securities held in non-qualified compensation plans (1) | $ | 3,057 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,057 |
Cash surrender value of life insurance policies (1) | — |  |  | 76 |  |  | — |  |  | 76 |
Total | $ | 3,057 |  |  | $ | 76 |  |  | $ | — |  |  | $ | 3,133 |
Financial Liabilities |  |  |  |  |  |  |
Non-qualified compensation plans (2) | $ | — |  |  | $ | 3,519 |  |  | $ | — |  |  | $ | 3,519 |
Interest rate swap derivatives | — |  |  | 1 |  |  | — |  |  | 1 |
Total | $ | — |  |  | $ | 3,520 |  |  | $ | — |  |  | $ | 3,520 |
| 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets |  |  |  |  |  |  |
Trading securities held in non-qualified compensation plans (1) | $ | 4,050 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,050 |
Cash surrender value of life insurance policies (1) | — |  |  | 65 |  |  | — |  |  | 65 |
Total | $ | 4,050 |  |  | $ | 65 |  |  | $ | — |  |  | $ | 4,115 |
Financial Liabilities |  |  |  |  |  |  |
Non-qualified compensation plans (2) | $ | — |  |  | $ | 4,462 |  |  | $ | — |  |  | $ | 4,462 |
Interest rate swap derivatives | — |  |  | 5 |  |  | — |  |  | 5 |
Total | $ | — |  |  | $ | 4,467 |  |  | $ | — |  |  | $ | 4,467 |
(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 |  | 2019 |  | 2018 |
Weighted average common shares outstanding |  |  |  |  |
Basic |  | 2,742 |  |  | 2,720 |  |
Dilutive effect of stock options and RSUs |  | 52 |  |  | 57 |  |
Weighted average common shares outstanding—diluted |  | 2,794 |  |  | 2,777 |  |

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