Consolidated Balance Sheets - USD ($)		May 31, 2024	May 31, 2023
Current assets
Cash and cash equivalents		$ 2,831,471	$ 3,575,219
Short-term investments		28,131,279	24,514,757
Accounts and other receivables, net (Note 2)	[1]	5,212,408	5,553,504
Inventory (Note 3)	[2]	7,512,052	5,941,304
Prepaid expenses		725,506	439,607
Prepaid income taxes		0	228,947
Costs and estimated earnings in excess of billings (Note 4)	[3]	4,356,565	4,124,182
Total current assets		48,769,281	44,377,520
Maintenance and other inventory, net (Note 5)	[4]	1,579,829	1,003,140
Property and equipment, net (Note 6)	[5]	11,180,933	11,721,784
Patents, net		292,593	0
Cash value of life insurance, net		214,824	210,120
Other assets		27,343	0
Deferred income taxes (Note 10)	[6]	1,012,615	568,615
Assets		63,077,418	57,881,179
Current liabilities
Accounts payable		1,438,847	1,717,657
Accrued expenses (Note 8)	[7]	4,664,463	4,078,322
Billings in excess of costs and estimated earnings (Note 4)	[3]	5,601,274	1,992,470
Accrued income taxes		126,148	0
Total current liabilities		11,830,732	7,788,449
Stockholders' Equity
Common Stock, Value		104,056	102,127
Paid-in capital		12,959,531	10,947,089
Retained earnings		51,127,018	42,128,256
Treasury stock - 1,046,742 and 567,751 shares at cost		(12,943,919)	(3,084,742)
Total stockholders' equity		51,246,686	50,092,730
Liabilities and Equity		$ 63,077,418	$ 57,881,179

[1] Note 2

[2] Note 3

[3] Note 4Note 4

[4] Note 5

[5] Note 6

[6] Note 10Note 10

[7] Note 8