Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Nov. 30, 2025	May 31, 2025
Current assets
Cash and cash equivalents	$ 1,956,030	$ 1,190,656
Short-term investments	38,787,922	34,799,367
Accounts receivable, net	5,180,955	5,599,785
Inventory	7,867,303	8,113,321
Costs and estimated earnings in excess of billings	2,424,165	5,360,499
Other current assets	1,712,737	1,219,211
Total current assets	57,929,112	56,282,839
Maintenance and other inventory, net	1,162,840	1,107,875
Property and equipment, net	12,659,629	12,074,172
Patents, net	259,258	270,370
Other assets	287,279	284,864
Deferred income taxes	546,000	1,598,000
Assets	72,844,118	71,618,120
Current liabilities
Accounts payable	1,616,645	1,119,240
Accrued expenses	2,544,802	4,072,436
Billings in excess of costs and estimated earnings	1,621,647	4,382,067
Total current liabilities	5,783,094	9,573,743
Stockholders' equity
Common stock and additional paid-in capital	15,531,385	14,649,415
Retained earnings	64,738,862	60,540,154
Treasury stock - at cost	(13,209,223)	(13,145,192)
Total stockholders' equity	67,061,024	62,044,377
Liabilities and Equity	$ 72,844,118	$ 71,618,120