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Deferred Revenue	6 Months Ended
Nov. 30, 2019
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(s). Customer advances totaled $-0- and $3,280,500 during the six months ended November 30, 2019 and 2018, respectively. Revenue recognition from customer advances during the six months ended November 30, 2019 was $686,572. The unrecognized balance of deferred revenue at November 30, 2019 and May 31, 2019, was $1,514,495 and $2,201,067, respectively.

Deferred Revenue

6 Months Ended

Nov. 30, 2019

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(s). Customer advances totaled $-0- and $3,280,500 during the six months ended November 30, 2019 and 2018, respectively. Revenue recognition from customer advances during the six months ended November 30, 2019 was $686,572. The unrecognized balance of deferred revenue at November 30, 2019 and May 31, 2019, was $1,514,495 and $2,201,067, respectively.