Summary of Significant Accounting Policies (Tables)

12 Months Ended

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