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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2016

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		2016				2015				2014
Balance at beginning of year		$	171			$	229			$	194
Bad debt provision			74				55				116
Doubtful accounts written off (net)			(43	)			(113	)			(81	)
Balance at end of year		$	202			$	171			$	229

Schedule of Property Plant and Equipment

Property, plant and equipment consisted of the following at April 30:

$ in thousands		2016				2015				Useful Life
Land		$	41			$	41				N/A
Building and improvements			15,638				15,369				10-40 years
Machinery and equipment			34,249				32,757				5-10 years
Total			49,928				48,167
Less accumulated depreciation			(35,810	)			(33,644	)
Net property, plant and equipment		$	14,118			$	14,523

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, 2016 and 2015 (in thousands):

		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
		2015
Financial Assets				Level 1				Level 2				Level 3				Total
Trading securities held in non-qualified compensation plans (1)				$	3,683			$	—			$	—			$	3,683
Cash surrender value of life insurance policies (1)					—				47				—				47
Total				$	3,683			$	47			$	—			$	3,730
Financial Liabilities
Non-qualified compensation plans (2)				$	—			$	4,119			$	—			$	4,119
Interest rate swap derivatives					—				203				—				203
Total				$	—			$	4,322			$	—			$	4,322

(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		2016				2015				2014
Weighted average common shares outstanding
Basic			2,667				2,626				2,608
Dilutive effect of stock options			20				32				26
Weighted average common shares outstanding—diluted			2,687				2,658				2,634

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