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Deferred Revenue	6 Months Ended
Nov. 30, 2020
Revenue from Contract with Customer [Abstract]
Deferred Revenue	Note 8. Deferred Revenue Advances from a customer pursuant to a contract for the sale of plastic pallets is recognized as deferred revenue. Revenue is recognized by Greystone as pallets are shipped to the customer which totaled $3,770,160 and $686,572 during the six months ended November 30, 2020 and 2019, respectively. Customer advances received during the six months ended November 30, 2020 and 2019 were $1,380,000 and $-0-, respectively. The unrecognized balance of deferred revenue as of November 30, 2020 and May 31, 2020, was $1,403,007 and $3,793,167, respectively.

Deferred Revenue

6 Months Ended

Nov. 30, 2020

Revenue from Contract with Customer [Abstract]

Note 8. Deferred Revenue

Advances from a customer pursuant to a contract for the sale of plastic pallets is recognized as deferred revenue. Revenue is recognized by Greystone as pallets are shipped to the customer which totaled $3,770,160 and $686,572 during the six months ended November 30, 2020 and 2019, respectively. Customer advances received during the six months ended November 30, 2020 and 2019 were $1,380,000 and $-0-, respectively. The unrecognized balance of deferred revenue as of November 30, 2020 and May 31, 2020, was $1,403,007 and $3,793,167, respectively.