Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Current assets:
Cash and cash equivalents	$ 5,461	$ 4,782
Marketable securities	16,678	17,658
Accounts receivable, net of allowance for doubtful accounts of $400 at July 31, 2012 and April 30, 2012	9,699	10,866
Costs and estimated earnings in excess of billings, net	8,649	7,207
Inventories	34,532	34,299
Deferred income taxes	3,033	3,152
Prepaid expenses and other	1,306	1,398
Total current assets	79,358	79,362
Property, plant and equipment, at cost, less accumulated depreciation and amortization	8,126	8,374
Deferred income taxes	5,692	5,692
Goodwill and other intangible assets	850	873
Cash surrender value of life insurance and cash held in trust	10,290	10,133
Investment in affiliates	807	809
Other assets	967	984
Total assets	106,090	106,227
Current liabilities:
Short-term credit obligations	6,317	6,383
Accounts payable - trade	1,643	2,644
Accrued liabilities	6,770	6,986
Income taxes payable	396	96
Total current liabilities	15,126	16,109
Capital lease obligation- noncurrent		15
Deferred compensation	10,225	10,179
Deferred rent and other liabilities	865	792
Total liabilities	26,216	27,095
Commitments and contingencies
Stockholders' equity:
Preferred stock - $1.00 par value
Common stock - $1.00 par value, issued 9,163,940 shares	9,164	9,164
Additional paid-in capital	51,017	50,797
Retained earnings	19,428	18,660
Stockholders' Equity before Treasury Stock, Total	79,609	78,621
Common stock reacquired and held in treasury - at cost (771,639 shares at July 31, 2012 and 800,787 shares at April 30, 2012)	(3,519)	(3,659)
Accumulated other comprehensive income	3,784	4,170
Total stockholders' equity	79,874	79,132
Total liabilities and stockholders' equity	$ 106,090	$ 106,227