Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	May 31, 2024	May 31, 2023
Operating activities
Net income	$ 8,998,762	$ 6,287,358
Adjustments to reconcile net income to net cash flows from operating activities
Depreciation	1,690,239	1,472,455
Amortization	7,407	0
Stock options issued for services	1,047,252	417,253
Bad debt expense	0	23,360
Loss on disposal of property and equipment	0	20,015
Provision for inventory obsolescence	385,744	295,014
Deferred income taxes	(444,000)	(494,000)
Changes in other current assets and liabilities
Accounts and other receivables	341,096	(1,110,178)
Inventory	(2,533,181)	(277,214)
Prepaid expenses	(285,899)	28,882
Prepaid income taxes	228,947	7,000
Costs and estimated earnings in excess of billings	(232,383)	(787,708)
Accounts payable	(278,810)	290,827
Accrued expenses	586,141	664,008
Billings in excess of costs and estimated earnings	3,608,804	869,707
Accrued income taxes	126,148	0
Other assets	(27,343)	0
Net operating activities	13,218,924	7,706,779
Investing activities
Acquisition of property and equipment	(1,149,388)	(3,359,495)
Patent expenditures	(300,000)	0
Increase in short-term investments	(3,616,522)	(23,417,307)
Increase in cash value of life insurance	(4,704)	(4,761)
Net investing activities	(5,070,614)	(26,781,563)
Financing activities
Proceeds from issuance of common stock	967,119	302,705
Acquisition of treasury stock	(9,859,177)	(169,740)
Net financing activities	(8,892,058)	132,965
Net change in cash and cash equivalents	(743,748)	(18,941,819)
Cash and cash equivalents - beginning	3,575,219	22,517,038
Cash and cash equivalents - ending	$ 2,831,471	$ 3,575,219