Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Cash Flows from Operating Activities:
Net income	$ 2,032,231	$ 1,091,984
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	3,021,502	2,560,516
Deferred tax expense	911,000	320,000
Decrease in trade accounts receivable	2,584,492	1,929,597
Increase in related party receivables	(43,109)	(53,514)
Decrease (increase) in inventory	973,259	(1,072,000)
Decrease (increase) in prepaid expenses	(69,061)	139,168
Increase (decrease) in accounts payable and accrued liabilities	(1,217,243)	687,310
Decrease in deferred revenue	(2,390,160)	(686,572)
Net cash provided by operating activities	5,802,911	4,916,489
Cash Flows from Investing Activities:
Purchase of property and equipment	(1,290,604)	(2,018,815)
Cash Flows from Financing Activities:
Proceeds from long-term debt		672,000
Payments on long-term debt and financing leases	(2,429,656)	(2,390,138)
Proceeds from revolving loan	1,250,000	690,000
Payments on revolving loan	(2,690,000)	(972,000)
Payments on related party note payable and financing lease	(751,821)	(222,384)
Payments for debt issuance costs		(3,360)
Dividends paid on preferred stock	(166,028)	(224,555)
Distributions paid by non-controlling interest	(104,400)	(121,800)
Net cash used in financing activities	(4,891,905)	(2,572,237)
Net Increase (Decrease) in Cash	(379,598)	325,437
Cash, beginning of period	1,131,850	1,255,408
Cash, end of period	752,252	1,580,845
Non-cash Activities:
Capital expenditures in accounts payable	282,540	507,851
Equipment transferred from inventory	26,750
Preferred dividend accrual	81,918	102,637
Supplemental information:
Interest paid	$ 632,488	$ 913,992