Consolidated Balance Sheets - USD ($)	May 31, 2017	May 31, 2016
Current Assets:
Cash	$ 579,021	$ 897,377
Accounts receivable - Trade, net of allowance for doubtful accounts of $31,660 and $13,260, respectively	6,160,145	4,936,027
Related party receivables	73,578	150,113
Inventory	1,587,552	1,304,495
Prepaid expenses	136,395	70,058
Total Current Assets	8,536,691	7,358,070
Property, Plant and Equipment, net of accumulated depreciation	19,706,782	12,565,319
Deferred Tax Asset	281,415	1,283,682
Other Assets		23,405
Total Assets	28,524,888	21,230,476
Current Liabilities:
Current portion of long-term debt	2,493,236	2,088,327
Current portion of capital lease	2,261,560
Accounts payable and accrued expenses	5,727,903	4,041,565
Accrued expenses - related parties	29,076	2,475,690
Preferred dividends payable	29,726	60,005
Total Current Liabilities	10,541,501	8,665,587
Long-Term Debt, net of current portion	15,310,754	13,289,236
Capital lease, net of current portion	1,532,503
Equity:
Preferred stock, $0.0001 par value, cumulative, 20,750,000 shares authorized, 50,000 shares issued and outstanding, liquidation preference of $5,000,000	5	5
Common stock, $0.0001 par value, 5,000,000,000 shares authorized, 28,361,201 and 27,886,201 shares issued and outstanding	2,836	2,789
Additional paid-in capital	53,790,764	53,613,811
Accumulated deficit	(53,724,991)	(55,385,912)
Total Greystone Stockholders' Equity (Deficit)	68,614	(1,769,307)
Non-controlling interest	1,071,516	1,044,960
Total Equity (Deficit)	1,140,130	(724,347)
Total Liabilities and Equity (Deficit)	$ 28,524,888	$ 21,230,476

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.