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Condensed Consolidated Statements of Cash Flow - USD ($)
 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Operating activities:    
Net income $ 1,003,619 $ 2,054,335
Adjustments to reconcile net income to net cash flows from operating activities:    
   Depreciation 938,493 841,194
   Stock options issued for services 49,717 55,437
   Paycheck Protection Program loan forgiveness (1,461,500)
   Changes in other assets and liabilities:    
      Accounts and other receivables 794,814 282,105
      Inventory 1,193,304 595,847
      Costs and estimated earnings in excess of billings 743,206 5,441,173
      Other current assets (420,881) 80,522
      Accounts payable (164,375) 206,092
      Accrued commissions 96,235 (794,442)
      Other current liabilities (644,042) (70,665)
      Billings in excess of costs and estimated earnings (103,650) 1,370,512
          Net operating activities 2,024,940 10,062,110
Investing activities:    
   Acquisition of property and equipment (1,089,069) (992,272)
   Other investing activities (22,391) (13,921)
          Net investing activities (1,111,460) (1,006,193)
Financing activities:    
   Proceeds from issuance of common stock, net 11,411 10,233
          Net change in cash and cash equivalents 924,891 9,066,150
Cash and cash equivalents - beginning 15,159,827 5,071,822
          Cash and cash equivalents - ending $ 16,084,718 $ 14,137,972