v3.26.1
Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
Feb. 28, 2026
May 31, 2025
Current assets    
Cash and cash equivalents $ 2,530,424 $ 1,190,656
Short-term investments 39,181,924 34,799,367
Accounts receivable, net 4,863,234 5,599,785
Inventory 7,481,184 8,113,321
Costs and estimated earnings in excess of billings 5,681,210 5,360,499
Other current assets 1,371,101 1,219,211
Total current assets 61,109,077 56,282,839
Maintenance and other inventory, net 783,353 1,107,875
Property and equipment, net 12,702,256 12,074,172
Patents, net 253,702 270,370
Other assets 288,323 284,864
Deferred income taxes 316,000 1,598,000
Assets 75,452,711 71,618,120
Current liabilities    
Accounts payable 1,129,072 1,119,240
Accrued expenses 2,772,627 4,072,436
Billings in excess of costs and estimated earnings 1,404,085 4,382,067
Total current liabilities 5,305,784 9,573,743
Stockholders' equity    
Common stock and additional paid-in capital 16,733,835 14,649,415
Retained earnings 67,237,002 60,540,154
Treasury stock - at cost (13,823,910) (13,145,192)
Total stockholders' equity 70,146,927 62,044,377
Liabilities and Equity $ 75,452,711 $ 71,618,120