Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2021	Apr. 30, 2021
Current assets:
Cash and cash equivalents	$ 10,623	$ 9,807
Marketable securities	9,955	10,313
Accounts receivable, net of allowance for doubtful accounts of $111 at October 31, 2021 and April 30, 2021	8,743	5,515
Costs and estimated earnings in excess of billings, net	0	1,948
Inventories, net	19,477	19,661
Prepaid income taxes	453	444
Prepaid expenses and other	1,226	991
Total current assets	50,477	48,679
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	9,403	9,612
Goodwill	617	617
Cash surrender value of life insurance	9,990	15,396
Other assets	1,804	1,939
Right-of-Use assets – operating leases	9,087	9,773
Total assets	81,378	86,016
Current liabilities:
Accounts payable – trade	970	1,080
Accrued liabilities	3,710	5,245
Loss provision accrual	72	57
Operating lease liability	1,779	1,715
Billings in excess of costs and estimated earnings, net	3,479	0
Total current liabilities	10,010	8,097
Deferred compensation	9,007	14,017
Deferred taxes	8	8
Operating lease liability – non-current	7,605	8,366
Other liabilities	119	119
Total liabilities	26,749	30,607
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $1.00 par value; authorized 600 shares, no shares issued
Common stock - $1.00 par value; authorized 20,000 shares, 9,264 shares issued and 9,263 shares outstanding at October 31, 2021; 9,226 shares issued and 9,225 shares outstanding at April 30, 2021	9,264	9,226
Additional paid-in capital	57,693	57,355
Accumulated deficit	(12,535)	(11,457)
Common stock reacquired and held in treasury - at cost (1 share at October 31, 2021 and 1 share at April 30, 2021)	(6)	(6)
Accumulated other comprehensive income	213	291
Total stockholders’ equity	54,629	55,409
Total liabilities and stockholders’ equity	$ 81,378	$ 86,016