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Condensed Consolidated Balance Sheets - USD ($)
Feb. 28, 2021
May 31, 2020
Current assets:    
Cash and cash equivalents $ 16,084,718 $ 15,159,827
Short-term investments 1,090,582 1,071,950
Accounts and other receivables, net 5,024,657 5,819,471
Inventory 8,550,215 10,107,437
Costs and estimated earnings in excess of billings 1,011,367 1,754,573
Other current assets 931,241 510,360
Total current assets 32,692,780 34,423,618
Maintenance and other inventory, net 1,242,968 879,050
Property and equipment, net 9,558,066 9,407,490
Other assets 199,380 195,621
Deferred income taxes 170,115 170,115
Total assets 43,863,309 45,075,894
Current liabilities:    
Short-term borrowings 1,461,500
Accounts payable 1,205,800 1,370,175
Accrued commissions 402,120 305,885
Other current liabilities 1,019,872 1,663,914
Billings in excess of costs and estimated earnings 633,216 736,866
Total current liabilities 3,261,008 5,538,340
Stockholders' Equity:    
Common stock and additional paid-in capital 9,946,679 9,860,006
Retained earnings 33,542,199 32,538,580
Stockholders’ equity before treasury stock 43,488,878 42,398,586
Treasury stock - at cost (2,886,577) (2,861,032)
Total stockholders’ equity 40,602,301 39,537,554
Total liabilities and stockholders’ equity $ 43,863,309 $ 45,075,894