Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 619,299	$ 764,908
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	1,305,258	1,085,267
Deferred tax expense	185,000	331,600
Decrease in trade accounts receivable	1,473,523	479,605
Increase in related party receivables	(14,754)	(40,542)
Decrease (increase) in inventory	(1,434,527)	19,715
Decrease in prepaid expenses	213,410	40,462
Increase (decrease) in accounts payable and accrued liabilities	(271,366)	2,543,462
Decrease in deferred revenue		(3,280,500)
Net cash provided by operating activities	2,075,843	1,943,977
Cash Flows from Investing Activities:
Purchase of property and equipment	(1,172,574)	(1,477,449)
Cash Flows from Financing Activities:
Proceeds from long-term debt	672,000	1,856,800
Principal payments on long-term debt and financing leases	(1,161,478)	(1,101,336)
Proceeds from revolving loan	690,000	1,000,000
Principal payments on revolving loan	(972,000)	(1,300,000)
Principal payments on related party note payable and financing lease	(90,095)	(61,887)
Payments for debt issuance costs	(3,360)
Dividends paid on preferred stock	(112,192)
Distributions paid by non-controlling interest	(52,200)	(51,000)
Net cash provided by (used in) financing activities	(1,029,325)	342,577
Net Increase (Decrease) in Cash	(126,056)	809,105
Cash, beginning of period	1,255,408	379,632
Cash, end of period	1,129,352	1,188,737
Non-cash Activities:
Acquisition of equipment by capital lease		2,333,333
Capital expenditures in accounts payable	271,670	110,182
Preferred dividend accrual	112,363	102,945
Supplemental information:
Interest paid	$ 480,802	$ 396,786