Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Nov. 30, 2023	May 31, 2023
Current assets
Cash and cash equivalents	$ 3,161,073	$ 3,575,219
Short-term investments	31,749,306	24,514,757
Accounts and other receivables, net	4,072,100	5,553,504
Inventory	6,856,688	5,941,304
Costs and estimated earnings in excess of billings	1,722,509	4,124,182
Other current assets	396,947	668,554
Total current assets	47,958,623	44,377,520
Maintenance and other inventory, net	1,312,024	1,003,140
Property and equipment, net	11,355,629	11,721,784
Other assets	239,956	210,120
Deferred income taxes	568,615	568,615
Assets	61,434,847	57,881,179
Current liabilities
Accounts payable	1,167,935	1,717,657
Accrued expenses	3,032,571	4,078,322
Billings in excess of costs and estimated earnings	3,006,016	1,992,470
Total current liabilities	7,206,522	7,788,449
Stockholders' Equity
Common stock and additional paid-in capital	11,371,399	11,049,216
Retained earnings	45,957,467	42,128,256
Treasury stock - at cost	(3,100,541)	(3,084,742)
Total stockholders' equity	54,228,325	50,092,730
Liabilities and Equity	$ 61,434,847	$ 57,881,179