Consolidated Balance Sheets - USD ($)	May 31, 2022	May 31, 2021
Current assets:
Cash and cash equivalents	$ 22,517,038	$ 20,581,604
Short-term investments	1,097,450	1,097,012
Accounts and other receivables, net	4,466,686	4,120,564
Inventory	5,854,935	5,835,596
Prepaid expenses	468,489	522,747
Prepaid income taxes	235,947	454,778
Costs and estimated earnings in excess of billings	3,336,474	1,499,604
Total current assets	37,977,019	34,111,905
Maintenance and other inventory, net	1,107,309	1,612,839
Property and equipment, net	9,854,759	9,816,594
Cash value of life insurance, net	205,359	200,538
Deferred income taxes	74,615	190,115
Total assets	49,219,061	45,931,991
Current liabilities:
Accounts payable	1,426,830	1,787,325
Accrued commissions	84,907	269,064
Other accrued expenses	3,329,407	1,715,409
Billings in excess of costs and estimated earnings	1,122,763	1,361,985
Total current liabilities	5,963,907	5,133,783
Stockholders' Equity:
Common stock, $.025 par value, authorized 8,000,000 shares,    issued 4,056,771 and 4,055,275 shares	101,342	101,305
Paid-in capital	10,227,916	10,010,430
Retained earnings	35,840,898	33,601,475
Stockholders’ equity before treasury stock	46,170,156	43,713,210
Treasury stock – 558,834 shares at cost	(2,915,002)	(2,915,002)
Total stockholders' equity	43,255,154	40,798,208
Total liabilities and stockholders’ equity	$ 49,219,061	$ 45,931,991