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Income Taxes (Tables) | 12 Months Ended
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Apr. 30, 2018
Income Tax Disclosure [Abstract] |
Income Tax Expense | Income tax expense consisted of the following:
$ in thousands |  | 2018 |  |  | 2017 |  |  | 2016 |
Current tax expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 1,719 |  |  | $ | 891 |  |  | $ | 974 |
State and local |  |  | 311 |  |  |  | 120 |  |  |  | 117 |
Foreign |  |  | 1,414 |  |  |  | 1,467 |  |  |  | 1,122 |
Total current tax expense |  |  | 3,444 |  |  |  | 2,478 |  |  |  | 2,213 |
Deferred tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 401 |  |  |  | (108 | ) |  |  | (431 | )
State and local |  |  | 28 |  |  |  | 24 |  |  |  | 98 |
Foreign |  |  | 242 |  |  |  | (268 | ) |  |  | (18 | )
Total deferred tax expense (benefit) |  |  | 671 |  |  |  | (352 | ) |  |  | (351 | )
Net income tax expense |  | $ | 4,115 |  |  | $ | 2,126 |  |  | $ | 1,862 |
Schedule of Income Tax Reconciliation | The reasons for the differences between the above net income tax expense and the amounts computed by applying the statutory federal income tax rate to earnings before income taxes are as follows:
$ in thousands |  | 2018 |  |  | 2017 |  |  | 2016 |
Income tax expense at statutory rate |  | $ | 2,818 |  |  | $ | 2,294 |  |  | $ | 1,952 |
State and local taxes, net of federal income tax benefit (expense) |  |  | 162 |  |  |  | 100 |  |  |  | 102 |
Tax credits (state, net of federal benefit) |  |  | (370 | ) |  |  | (110 | ) |  |  | (407 | )
Effects of differing US and foreign tax rates |  |  | (97 | ) |  |  | (7 | ) |  |  | 173 |
Rate reduction impact on deferred tax assets |  |  | 680 |  |  |  | — |  |  |  | — |
Federal and state transition tax on unrepatriated foreign earnings |  |  | 649 |  |  |  | — |  |  |  | — |
Increase (decrease) in valuation allowance |  |  | 175 |  |  |  | 82 |  |  |  | (10 | )
Other items, net |  |  | 98 |  |  |  | (233 | ) |  |  | 52 |
Net income tax expense |  | $ | 4,115 |  |  | $ | 2,126 |  |  | $ | 1,862 |
Summary of Deferred Tax Assets and Liabilities | Significant items comprising deferred tax assets and liabilities as of April 30 were as follows:
$ in thousands |  | 2018 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Accrued employee benefit expenses |  | $ | 418 |  |  | $ | 549 |
Allowance for doubtful accounts |  |  | 41 |  |  |  | 67 |
Deferred compensation |  |  | 1,205 |  |  |  | 1,792 |
Tax credits |  |  | 221 |  |  |  | 208 |
Unrecognized actuarial loss, defined benefit plans |  |  | 1,825 |  |  |  | 3,223 |
Inventory Reserves |  |  | 378 |  |  |  | 360 |
Net operating loss carryforwards |  |  | 261 |  |  |  | 224 |
Other |  |  | 79 |  |  |  | 113 |
Total deferred tax assets |  |  | 4,428 |  |  |  | 6,536 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Book basis in excess of tax basis of property, plant and equipment |  |  | (1,043 | ) |  |  | (1,600 | )
Prepaid pension |  |  | (1,093 | ) |  |  | (1,696 | )
Total deferred tax liabilities |  |  | (2,136 | ) |  |  | (3,296 | )
Less: valuation allowance |  |  | (261 | ) |  |  | (82 | )
Net deferred tax assets |  | $ | 2,031 |  |  | $ | 3,158 |
Deferred tax assets classified in the balance sheet: |  |  |  |  |  |  |  |
Non-current |  |  | 2,031 |  |  |  | 3,158 |
Net deferred tax assets |  | $ | 2,031 |  |  | $ | 3,158 |

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