Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Feb. 28, 2025	May 31, 2024
Current assets
Cash and cash equivalents	$ 2,301,704	$ 2,831,471
Short-term investments	33,135,711	28,131,279
Accounts and other receivables, net	6,716,656	5,212,408
Inventory	8,805,159	7,512,052
Costs and estimated earnings in excess of billings	3,229,752	4,356,565
Other current assets	2,202,339	725,506
Total current assets	56,391,321	48,769,281
Maintenance and other inventory, net	1,230,668	1,579,829
Property and equipment, net	10,952,309	11,180,933
Patents, net	275,925	292,593
Other assets	283,775	242,167
Deferred income taxes	1,012,615	1,012,615
Assets	70,146,613	63,077,418
Current liabilities
Accounts payable	1,114,710	1,438,847
Accrued expenses	7,996,709	4,664,463
Billings in excess of costs and estimated earnings	3,232,563	5,601,274
Accrued income taxes	0	126,148
Total current liabilities	12,343,982	11,830,732
Stockholders' Equity
Common stock and additional paid-in capital	14,034,745	13,063,587
Retained earnings	56,852,078	51,127,018
Treasury stock - at cost	(13,084,192)	(12,943,919)
Total stockholders' equity	57,802,631	51,246,686
Liabilities and Equity	$ 70,146,613	$ 63,077,418