Related Party Transactions	12 Months Ended
May 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 7. RELATED PARTY TRANSACTIONS Transactions with Warren F. Kruger, Chairman Yorktown Management & Financial Services, LLC (“Yorktown”), an entity wholly owned by Greystone’s CEO and President, owns and rents to Greystone (1) grinding equipment used to grind raw materials for Greystone’s pallet production and (2) extruders for pelletizing recycled plastic into pellets for resale and for use as raw material in the manufacture of pallets. Greystone compensates Yorktown for the use of equipment as discussed below. Rental fees. GSM pays weekly rental fees of $22,500 and $5,000 to Yorktown for grinding equipment and pelletizing equipment, respectively. Total rental fees of approximately $1,430,000 were paid in both fiscal years 2018 and 2017. Yorktown provides office space in Tulsa, Oklahoma for Greystone at a monthly rental of $2,200 until December 31, 2016. Effective January 1, 2017, Greystone and Yorktown entered into a five-year lease for expanded office space at a monthly rental of $4,000 per month. Total rent expense was $48,000 and $35,400 for fiscal years 2018 and 2017, respectively. At May 31, 2018, future minimum payments under the non-cancelable operating lease are $48,000 for fiscal years 2019, 2020 and 2021 and $28,000 for fiscal year 2022. Acquisitions from Yorktown. On September 1, 2016, Yorktown acquired the plastic resin pelletizing equipment from TriEnda Holdings, L.L.C., which was used by Greystone to blend and pelletize plastic resin for a tolling fee. During the period from September 1, 2016 through January 31, 2017, Greystone rented this equipment from Yorktown for a total of $163,204. Effective February 1, 2017, Greystone acquired this equipment from Yorktown for $1,500,076, which included a cash payment of $30,627 and the assumption of a note payable to First Bank in the amount of $1,469,713. Compensation related to Loan Guarantees. Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to Mr. Kruger and a cash payment of $65,000 as compensation for providing guarantees on Greystone’s debt with International Bank of Commerce. The warrants are vested and expire January 10, 2027. The warrants, valued as of the measurement date for approximately $60,000, and the cash payment were capitalized as debt issue costs to be amortized over the remaining loan term. Transactions with TriEnda Holdings, L.L.C. TriEnda Holdings, L.L.C. (“TriEnda”) is a manufacturer of plastic pallets, protective packaging and dunnage utilizing thermoform processing of which Warren F. Kruger, Greystone’s President and CEO, is the non-executive chairman of the board of directors of Kruger Brown Holdings, LLC (“KBH”), which owns a majority interest in TriEnda. Mr. Kruger’s net interest through KBH is not a majority ownership interest in TriEnda. Greystone charged a tolling fee to TriEnda for blending and pelletizing plastic resin using TriEnda’s equipment and raw materials. Revenue from TriEnda totaled $538,024 in fiscal year 2017. Effective March 1, 2017, services to TriEnda were discontinued. Greystone purchases certain pallet designs from TriEnda for resale. During fiscal year 2018, Greystone purchases from TriEnda totaled $68,302. Transactions with Robert B. Rosene, Jr., Director Note payable. Effective December 15, 2005, Greystone entered into an agreement with Robert B. Rosene, Jr., a member of Greystone’s Board of Directors, to convert $2,066,000 of advances into a note payable at 7.5% interest. Effective June 1, 2016, the note payable to Mr. Rosene was restated (the “Restated Note”) whereby the accrued interest as of June 1, 2016 of $2,475,690 was combined with the outstanding principal of $2,066,000, resulting in a note payable in the principal amount of $4,541,690 with an interest rate of 7.5% and a maturity of January 15, 2018, subsequently amended to January 15, 2020. The Restated Note requires the payment of accrued interest to Mr. Rosene. In addition, the Restated Note allows Greystone to make additional payments, at Greystone’s discretion, up to an amount allowed by the IBC Loan Agreement. Compensation related to Loan Guarantees. Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to Mr. Rosene and a cash payment of $65,000 as compensation for providing guarantees on Greystone’s debt with International Bank of Commerce. The warrants are vested and expire January 10, 2027. The warrants, valued as of the measurement date for approximately $60,000, and the cash payment were capitalized as debt issue costs to be amortized over the remaining loan term. Transactions with Green Plastic Pallets Green Plastic Pallets (“Green”) is an entity owned by James Kruger, a brother to Warren Kruger, Greystone’s President and CEO. Green purchased pallets from Greystone totaling $421,966 and $312,130 in fiscal years 2018 and 2017, respectively. At May 31, 2018, Green owed $55,080 to Greystone.

Related Party Transactions

12 Months Ended

May 31, 2018

Note 7. RELATED PARTY TRANSACTIONS

Transactions with Warren F. Kruger, Chairman

Yorktown Management & Financial Services, LLC (“Yorktown”), an entity wholly owned by Greystone’s CEO and President, owns and rents to Greystone (1) grinding equipment used to grind raw materials for Greystone’s pallet production and (2) extruders for pelletizing recycled plastic into pellets for resale and for use as raw material in the manufacture of pallets. Greystone compensates Yorktown for the use of equipment as discussed below.

Rental fees. GSM pays weekly rental fees of $22,500 and $5,000 to Yorktown for grinding equipment and pelletizing equipment, respectively. Total rental fees of approximately $1,430,000 were paid in both fiscal years 2018 and 2017.

Yorktown provides office space in Tulsa, Oklahoma for Greystone at a monthly rental of $2,200 until December 31, 2016. Effective January 1, 2017, Greystone and Yorktown entered into a five-year lease for expanded office space at a monthly rental of $4,000 per month. Total rent expense was $48,000 and $35,400 for fiscal years 2018 and 2017, respectively. At May 31, 2018, future minimum payments under the non-cancelable operating lease are $48,000 for fiscal years 2019, 2020 and 2021 and $28,000 for fiscal year 2022.

Acquisitions from Yorktown. On September 1, 2016, Yorktown acquired the plastic resin pelletizing equipment from TriEnda Holdings, L.L.C., which was used by Greystone to blend and pelletize plastic resin for a tolling fee. During the period from September 1, 2016 through January 31, 2017, Greystone rented this equipment from Yorktown for a total of $163,204. Effective February 1, 2017, Greystone acquired this equipment from Yorktown for $1,500,076, which included a cash payment of $30,627 and the assumption of a note payable to First Bank in the amount of $1,469,713.

Compensation related to Loan Guarantees. Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to Mr. Kruger and a cash payment of $65,000 as compensation for providing guarantees on Greystone’s debt with International Bank of Commerce. The warrants are vested and expire January 10, 2027. The warrants, valued as of the measurement date for approximately $60,000, and the cash payment were capitalized as debt issue costs to be amortized over the remaining loan term.

Transactions with TriEnda Holdings, L.L.C.

TriEnda Holdings, L.L.C. (“TriEnda”) is a manufacturer of plastic pallets, protective packaging and dunnage utilizing thermoform processing of which Warren F. Kruger, Greystone’s President and CEO, is the non-executive chairman of the board of directors of Kruger Brown Holdings, LLC (“KBH”), which owns a majority interest in TriEnda. Mr. Kruger’s net interest through KBH is not a majority ownership interest in TriEnda. Greystone charged a tolling fee to TriEnda for blending and pelletizing plastic resin using TriEnda’s equipment and raw materials. Revenue from TriEnda totaled $538,024 in fiscal year 2017. Effective March 1, 2017, services to TriEnda were discontinued.

Greystone purchases certain pallet designs from TriEnda for resale. During fiscal year 2018, Greystone purchases from TriEnda totaled $68,302.

Transactions with Robert B. Rosene, Jr., Director

Note payable. Effective December 15, 2005, Greystone entered into an agreement with Robert B. Rosene, Jr., a member of Greystone’s Board of Directors, to convert $2,066,000 of advances into a note payable at 7.5% interest. Effective June 1, 2016, the note payable to Mr. Rosene was restated (the “Restated Note”) whereby the accrued interest as of June 1, 2016 of $2,475,690 was combined with the outstanding principal of $2,066,000, resulting in a note payable in the principal amount of $4,541,690 with an interest rate of 7.5% and a maturity of January 15, 2018, subsequently amended to January 15, 2020. The Restated Note requires the payment of accrued interest to Mr. Rosene. In addition, the Restated Note allows Greystone to make additional payments, at Greystone’s discretion, up to an amount allowed by the IBC Loan Agreement.

Compensation related to Loan Guarantees. Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to Mr. Rosene and a cash payment of $65,000 as compensation for providing guarantees on Greystone’s debt with International Bank of Commerce. The warrants are vested and expire January 10, 2027. The warrants, valued as of the measurement date for approximately $60,000, and the cash payment were capitalized as debt issue costs to be amortized over the remaining loan term.

Transactions with Green Plastic Pallets

Green Plastic Pallets (“Green”) is an entity owned by James Kruger, a brother to Warren Kruger, Greystone’s President and CEO. Green purchased pallets from Greystone totaling $421,966 and $312,130 in fiscal years 2018 and 2017, respectively. At May 31, 2018, Green owed $55,080 to Greystone.