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Summary of Significant Accounting Policies (Tables)

12 Months Ended

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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