v3.22.2.2
Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Operating activities:    
Net income $ 1,002,371 $ 181,877
Adjustments to reconcile net income to net cash flows from operating activities:    
   Depreciation 317,790 313,785
Changes in other assets and liabilities:    
      Accounts and other receivables (1,365,612) 1,364,269
      Inventory 57,869 387,855
      Costs and estimated earnings in excess of billings 503,936 (1,787,856)
      Other current assets 285,883 64,164
      Accounts payable 22,114 158,458
      Billings in excess of costs and estimated earnings 491,334 (394,560)
      Other current liabilities (1,346,571) (258,792)
          Net operating activities (30,886) 29,200
Investing activities:    
   Acquisition of property and equipment (833,464) (461,953)
   Other investing activities (1,140) (5,848)
          Net investing activities (834,604) (467,801)
Financing activities:    
   Proceeds from issuance of common stock, net 35,291 3,833
          Net change in cash and cash equivalents (830,199) (434,768)
Cash and cash equivalents – beginning 22,517,038 20,581,604
          Cash and cash equivalents – ending $ 21,686,839 $ 20,146,836