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Long-Term Debt - Schedule of Long-Term Debt (Details) (Parenthetical) - USD ($)
 12 Months Ended
May 31, 2021
May 31, 2020
Term Loan A Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Maturing April 30, 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Apr. 30, 2023 Apr. 30, 2023
Term Loan A Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Maturing April 30, 2023 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.00% 4.00%
Term Loan C Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Maturing August 4, 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Aug. 04, 2024 Aug. 04, 2024
Term Loan C Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.0%, Maturing August 4, 2024 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.00% 4.00%
Term Loan D Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.75%, Maturing January 10, 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Jan. 10, 2022 Jan. 10, 2022
Term Loan D Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.75%, Maturing January 10, 2022 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.75% 4.75%
Term Loan E Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.75%, Maturing February 28, 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Feb. 28, 2023 Feb. 28, 2023
Term Loan E Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.75%, Maturing February 28, 2023 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.75% 4.75%
Term Loan F Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 5.25%, Maturing February 29, 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Feb. 29, 2024 Feb. 29, 2024
Term Loan F Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 5.25%, Maturing February 29, 2024 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 5.25% 5.25%
Term Loan G Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 5.25%, Maturing April 30, 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Apr. 30, 2024 Apr. 30, 2024
Term Loan G Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 5.25%, Maturing April 30, 2024 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 5.25% 5.25%
Revolving Loan Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.50%, Due January 31, 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 0.50% 0.50%
Debt instrument maturity date Jan. 31, 2023 Jan. 31, 2023
Revolving Loan Payable to International Bank of Commerce, Prime Rate of Interest Plus 0.5% But Not Less Than 4.50%, Due January 31, 2023 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 4.50% 4.50%
Term Loan Payable by GRE to International Bank of Commerce, Interest Rate of 5.5%, Monthly Principal and Interest Payment of $27,688, Due April 30, 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 5.50% 5.50%
Debt instrument maturity date Apr. 30, 2023 Apr. 30, 2023
Debt instrument principal and interest amount $ 27,688 $ 27,688
Term Note Payable to Great Western Bank, Interest Rate of 3.7%, Monthly Principal and Interest Payments of $27,593, due March 19, 2025, Secured by Certain Equipment [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 3.70% 3.70%
Debt instrument maturity date Mar. 19, 2025 Mar. 19, 2025
Debt instrument principal and interest amount $ 27,593 $ 27,593
Note Payable to Robert Rosene, 7.5% Interest, Due January 15, 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate 7.50% 7.50%
Debt instrument maturity date Jan. 15, 2023 Jan. 15, 2023