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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Apr. 30, 2013
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 |  | 2013 |  |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 311 |  |  | $ | 250 |  |  | $ | 259 |
Bad debt provision |  |  | 34 |  |  |  | 214 |  |  |  | 60 |
Doubtful accounts written off (net) |  |  | (151 | ) |  |  | (153 | ) |  |  | (69 | )
Balance at end of year |  | $ | 194 |  |  | $ | 311 |  |  | $ | 250 |
Schedule of Property Plant and Equipment | Property, plant and equipment consisted of the following at April 30:
$ in thousands |  | 2013 |  |  | 2012 |  |  | Useful Life |
Land |  | $ | 41 |  |  | $ | 41 |  |  |  | N/A |
Building and improvements |  |  | 14,921 |  |  |  | 14,626 |  |  |  | 10-40 years |
Machinery and equipment |  |  | 30,147 |  |  |  | 28,889 |  |  |  | 5-10 years |
Total |  |  | 45,109 |  |  |  | 43,556 |  |  |  |  |
Less accumulated depreciation |  |  | (30,011 | ) |  |  | (28,210 | ) |  |  |  |
Net property, plant and equipment |  | $ | 15,098 |  |  | $ | 15,346 |  |  |  |  |
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, 2013 and 2012 (in thousands):
|  | 2013 |
Financial Assets |  |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Trading securities held in deferred compensation plan (1) |  |  |  | $ | 4,077 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,077 |
Cash surrender value of life insurance policies (1) |  |  |  |  | — |  |  |  | 96 |  |  |  | — |  |  |  | 96 |
Total |  |  |  | $ | 4,077 |  |  | $ | 96 |  |  | $ | — |  |  | $ | 4,173 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plans (2) |  |  |  | $ | — |  |  | $ | 4,399 |  |  | $ | — |  |  | $ | 4,399 |
Interest rate swap derivative |  |  |  |  | — |  |  |  | 344 |  |  |  | — |  |  |  | 344 |
Total |  |  |  | $ | — |  |  | $ | 4,743 |  |  | $ | — |  |  | $ | 4,743 |
|  | 2012 |
Financial Assets |  |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Trading securities held in deferred compensation plan (1) |  |  |  | $ | 3,454 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,454 |
Cash surrender value of life insurance policies (1) |  |  |  |  | — |  |  |  | 83 |  |  |  | — |  |  |  | 83 |
Total |  |  |  | $ | 3,454 |  |  | $ | 83 |  |  | $ | — |  |  | $ | 3,537 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plans (2) |  |  |  | $ | — |  |  | $ | 3,717 |  |  | $ | — |  |  | $ | 3,717 |
Interest rate swap derivative |  |  |  |  | — |  |  |  | 378 |  |  |  | — |  |  |  | 378 |
Total |  |  |  | $ | — |  |  | $ | 4,095 |  |  | $ | — |  |  | $ | 4,095 |
| (1) | The Company maintains an executive compensation plan which includes 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 the cash surrender value of life insurance policies. |
| (2) | The deferred compensation plan liability is equal to the individual participants’ account balances under the plan. |
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 |  | 2013 |  |  | 2012 |  |  | 2011 |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 2,587 |  |  |  | 2,579 |  |  |  | 2,575 |
Dilutive effect of stock options |  |  | 13 |  |  |  | 1 |  |  |  | 10 |
Weighted average common shares outstanding—diluted |  |  | 2,600 |  |  |  | 2,580 |  |  |  | 2,585 |

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- Definition Tabular disclosure related to assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a recurring and/or nonrecurring basis in periods after initial recognition. Disclosures include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3) as well as transfers between levels 1 and 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=7578670&loc=d3e19279-110258 Reference 3: 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=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 6: 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=7578670&loc=SL7498348-110258 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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