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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2017
Accounting Policies [Abstract] |
Schedule of Activity in Allowance for Doubtful Accounts | The activity in the allowance for doubtful accounts for each of the three years ended April 30 was:
$ in thousands |  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of year |  | $ | 202 |  |  | $ | 171 |  |  | $ | 229 |
Bad debt provision |  |  | 37 |  |  |  | 74 |  |  |  | 55 |
Doubtful accounts written off (net) |  |  | (48 | ) |  |  | (43 | ) |  |  | (113 | )
Balance at end of year |  | $ | 191 |  |  | $ | 202 |  |  | $ | 171 |
Schedule of Property Plant and Equipment | Property, plant and equipment consisted of the following at April 30:
$ in thousands |  | 2017 |  |  | 2016 |  |  | Useful Life |
Land |  | $ | 41 |  |  | $ | 41 |  |  |  | N/A |
Building and improvements |  |  | 15,892 |  |  |  | 15,638 |  |  |  | 10-40 years |
Machinery and equipment |  |  | 35,635 |  |  |  | 34,249 |  |  |  | 5-10 years |
Total |  |  | 51,568 |  |  |  | 49,928 |  |  |  |  |
Less accumulated depreciation |  |  | (37,541 | ) |  |  | (35,810 | ) |  |  |  |
Net property, plant and equipment |  | $ | 14,027 |  |  | $ | 14,118 |  |  |  |  |
Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis | 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, 2017 and 2016 (in thousands):
|  | 2017 |
Financial Assets |  |  |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Trading securities held in non-qualified compensation plans (1) |  |  |  |  |  | $ | 3,748 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,748 |
Cash surrender value of life insurance policies (1) |  |  |  |  |  |  | — |  |  |  | 75 |  |  |  | — |  |  |  | 75 |
Total |  |  |  |  |  | $ | 3,748 |  |  | $ | 75 |  |  | $ | — |  |  | $ | 3,823 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified compensation plans (2) |  |  |  |  |  | $ | — |  |  | $ | 4,186 |  |  | $ | — |  |  | $ | 4,186 |
Interest rate swap derivatives |  |  |  |  |  |  | — |  |  |  | 62 |  |  |  | — |  |  |  | 62 |
Total |  |  |  |  |  | $ | — |  |  | $ | 4,248 |  |  | $ | — |  |  | $ | 4,248 |
|  | 2016 |
Financial Assets |  |  |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Trading securities held in non-qualified compensation plans (1) |  |  |  |  |  | $ | 3,867 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,867 |
Cash surrender value of life insurance policies (1) |  |  |  |  |  |  | — |  |  |  | 62 |  |  |  | — |  |  |  | 62 |
Total |  |  |  |  |  | $ | 3,867 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 3,929 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified compensation plans (2) |  |  |  |  |  | $ | — |  |  | $ | 4,215 |  |  | $ | — |  |  | $ | 4,215 |
Interest rate swap derivatives |  |  |  |  |  |  | — |  |  |  | 166 |  |  |  | — |  |  |  | 166 |
Total |  |  |  |  |  | $ | — |  |  | $ | 4,381 |  |  | $ | — |  |  | $ | 4,381 |
| (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 Common Shares Outstanding | The following is a reconciliation of basic to diluted weighted average common shares outstanding:
Shares in thousands |  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 2,705 |  |  |  | 2,667 |  |  |  | 2,626 |
Dilutive effect of stock options |  |  | 21 |  |  |  | 20 |  |  |  | 32 |
Weighted average common shares outstanding—diluted |  |  | 2,726 |  |  |  | 2,687 |  |  |  | 2,658 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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