Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Feb. 29, 2024	May 31, 2023
Current assets
Cash and cash equivalents	$ 3,056,450	$ 3,575,219
Short-term investments	21,567,890	24,514,757
Accounts and other receivables, net	4,886,625	5,553,504
Inventory	6,677,772	5,941,304
Costs and estimated earnings in excess of billings	4,534,019	4,124,182
Other current assets	464,745	668,554
Total current assets	41,187,501	44,377,520
Maintenance and other inventory, net	1,360,932	1,003,140
Property and equipment, net	11,135,688	11,721,784
Patents, net	298,148	0
Other assets	241,051	210,120
Deferred income taxes	568,615	568,615
Assets	54,791,935	57,881,179
Current liabilities
Accounts payable	955,841	1,717,657
Accrued expenses	4,039,991	4,078,322
Billings in excess of costs and estimated earnings	1,960,286	1,992,470
Total current liabilities	6,956,118	7,788,449
Stockholders' Equity
Common stock and additional paid-in capital	11,794,037	11,049,216
Retained earnings	48,654,388	42,128,256
Treasury stock - at cost	(12,612,608)	(3,084,742)
Total stockholders' equity	47,835,817	50,092,730
Liabilities and Equity	$ 54,791,935	$ 57,881,179