Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Current assets:
Cash and cash equivalents	$ 9,807	$ 3,808
Marketable securities	10,313	10,570
Accounts receivable, net of allowance for doubtful accounts of $111 at April 30, 2021 and $183 at April 30, 2020	5,515	4,392
Costs and estimated earnings in excess of billings, net	1,948	6,953
Inventories, net	19,661	22,958
Prepaid income taxes	444	849
Prepaid expenses and other	991	1,705
Total current assets	48,679	51,235
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	9,612	11,267
Goodwill	617	617
Cash surrender value of life insurance	15,396	14,790
Other assets	1,939	2,503
Right-of-Use assets – operating leases	9,773	10,864
Total assets	86,016	91,276
Current liabilities:
Accounts payable – trade	1,080	1,424
Accrued liabilities	5,245	4,686
Loss provision accrual	57	748
Operating lease liability, current portion	1,715	1,869
Current debt		4,965
Total current liabilities	8,097	13,692
Deferred compensation	14,017	13,554
Deferred taxes	8	8
Operating lease liability – non-current	8,366	9,444
Other liabilities	119	342
Total liabilities	30,607	37,040
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock - $1.00 par value; authorized 600 shares, no shares issued
Common stock - $1.00 par value; authorized 20,000 shares, 9,226 shares issued and 9,225 shares outstanding at April 30, 2021; 9,164 shares issued and 9,121 shares outstanding at April 30, 2020	9,226	9,164
Additional paid-in capital	57,355	56,914
Accumulated deficit	(11,457)	(12,137)
Common stock reacquired and held in treasury - at cost (1 share at April 30, 2021 and 43 shares at April 30, 2020)	(6)	(195)
Accumulated other comprehensive income	291	490
Total stockholders’ equity	55,409	54,236
Total liabilities and stockholders’ equity	$ 86,016	$ 91,276