Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Nov. 30, 2024	May 31, 2024
Current assets
Cash and cash equivalents	$ 2,355,333	$ 2,831,471
Short-term investments	24,246,282	28,131,279
Accounts and other receivables, net	8,247,705	5,212,408
Inventory	8,610,730	7,512,052
Costs and estimated earnings in excess of billings	3,017,641	4,356,565
Other current assets	2,099,632	725,506
Total current assets	48,577,323	48,769,281
Maintenance and other inventory, net	1,427,583	1,579,829
Property and equipment, net	11,318,103	11,180,933
Patents, net	281,481	292,593
Other assets	244,627	242,167
Deferred income taxes	1,012,615	1,012,615
Assets	62,861,732	63,077,418
Current liabilities
Accounts payable	857,351	1,438,847
Accrued expenses	2,497,496	4,664,463
Billings in excess of costs and estimated earnings	3,707,908	5,601,274
Accrued income taxes	0	126,148
Total current liabilities	7,062,755	11,830,732
Stockholders' Equity
Common stock and additional paid-in capital	14,024,605	13,063,587
Retained earnings	54,849,833	51,127,018
Treasury stock - at cost	(13,075,461)	(12,943,919)
Total stockholders' equity	55,798,977	51,246,686
Liabilities and Equity	$ 62,861,732	$ 63,077,418