v3.25.2
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Operating activities    
Net income $ 2,190,084 $ 2,666,655
Adjustments to reconcile net income to net cash flows from operating activities    
Depreciation 452,838 380,178
Amortization 5,556 5,556
Deferred income taxes 500,000 0
Changes in other assets and liabilities    
Accounts and other receivables, net 1,076,264 (1,567,171)
Inventory (492,108) (345,691)
Costs and estimated earnings in excess of billings 656,358 23,467
Other current assets (371,606) (892,391)
Accounts payable (87,217) 409,075
Accrued expenses (1,929,267) (1,652,262)
Billings in excess of costs and estimated earnings (1,517,274) (2,616,913)
Net operating activities 483,628 (3,589,497)
Investing activities    
Acquisition of property and equipment (184,987) (246,962)
Decrease in short-term investments 647,903 3,158,584
Other investing activities (1,092) (1,113)
Net investing activities 461,824 2,910,509
Financing activities    
Proceeds from issuance of common stock, net 48,394 11,013
Acquisition of treasury stock (31,496) 0
Net financing activities 16,898 11,013
Net change in cash and cash equivalents 962,350 (667,975)
Cash and cash equivalents - beginning 1,190,656 2,831,471
Cash and cash equivalents - ending $ 2,153,006 $ 2,163,496