Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2018

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	2018			2017			2016
Balance at beginning of year	$	191		$	202		$	171
Bad debt provision		344			37			74
Doubtful accounts written off (net)		(151	)		(48	)		(43	)
Balance at end of year	$	384		$	191		$	202

Schedule of Property Plant and Equipment

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

$ in thousands	2018			2017			Useful Life
Land	$	41		$	41			N/A
Building and improvements		16,489			15,892			10-40 years
Machinery and equipment		38,118			35,635			5-10 years
Total		54,648			51,568
Less accumulated depreciation		(39,987	)		(37,541	)
Net property, plant and equipment	$	14,661		$	14,027

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, 2018 and 2017 (in thousands):

	2018
	Level 1		Level 2		Level 3		Total
Financial Assets
Trading securities held in non-qualified compensation plans (1)	$	4,050	$	—	$	—	$	4,050
Cash surrender value of life insurance policies (1)		—		65		—		65
Total	$	4,050	$	65	$	—	$	4,115
Financial Liabilities
Non-qualified compensation plans (2)	$	—	$	4,462	$	—	$	4,462
Interest rate swap derivatives		—		5		—		5
Total	$	—	$	4,467	$	—	$	4,467

	2017
	Level 1		Level 2		Level 3		Total
Financial Assets
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

(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	2018		2017		2016
Weighted average common shares outstanding
Basic		2,720		2,705		2,667
Dilutive effect of stock options		57		21		20
Weighted average common shares outstanding—diluted		2,777		2,726		2,687