Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Aug. 31, 2024	May 31, 2024
Current assets
Cash and cash equivalents	$ 2,163,496	$ 2,831,471
Short-term investments	24,972,695	28,131,279
Accounts and other receivables, net	6,779,579	5,212,408
Inventory	8,154,045	7,512,052
Costs and estimated earnings in excess of billings	4,333,098	4,356,565
Other current assets	1,617,897	725,506
Total current assets	48,020,810	48,769,281
Maintenance and other inventory, net	1,283,527	1,579,829
Property and equipment, net	11,047,717	11,180,933
Patents, net	287,037	292,593
Other assets	243,280	242,167
Deferred income taxes	1,012,615	1,012,615
Assets	61,894,986	63,077,418
Current liabilities
Accounts payable	1,847,922	1,438,847
Accrued expenses	2,396,249	4,664,463
Billings in excess of costs and estimated earnings	2,984,361	5,601,274
Accrued income taxes	742,100	126,148
Total current liabilities	7,970,632	11,830,732
Stockholders' Equity
Common stock and additional paid-in capital	13,074,600	13,063,587
Retained earnings	53,793,673	51,127,018
Treasury stock - at cost	(12,943,919)	(12,943,919)
Total stockholders' equity	53,924,354	51,246,686
Liabilities and Equity	$ 61,894,986	$ 63,077,418