Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 1,091,984	$ 1,061,853
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	2,560,516	2,178,499
Deferred tax expense	320,000	440,100
Decrease in trade accounts receivable	1,929,597	2,591,083
Increase in related party receivables	(53,514)	(41,262)
Increase in inventory	(1,072,000)	(2,298,739)
Decrease in prepaid expenses	139,168	159,246
Increase in accounts payable and accrued liabilities	687,310	2,272,400
Decrease in deferred revenue	(686,572)	(2,846,745)
Net cash provided by operating activities	4,916,489	3,516,435
Cash Flows from Investing Activities:
Purchases of property and equipment	(2,018,815)	(5,308,802)
Cash Flows from Financing Activities:
Proceeds from long-term debt	672,000	3,514,265
Principal payments on long-term debt and financing leases	(2,390,138)	(2,321,590)
Proceeds from revolving loan	690,000	2,421,000
Principal payments on revolving loan	(972,000)	(1,300,000)
Principal payments on related party note payable and financing lease	(222,384)	(122,501)
Payments for debt issuance costs	(3,360)
Dividends paid on preferred stock	(224,555)	(102,945)
Distributions paid by non-controlling interest	(121,800)	(102,000)
Net cash provided by (used in) financing activities	(2,572,237)	1,986,229
Net Increase in Cash	325,437	193,862
Cash, beginning of period	1,255,408	379,632
Cash, end of period	1,580,845	573,494
Non-cash Activities:
Acquisition of equipment by capital lease		2,333,333
Capital expenditures in accounts payable	507,851	110,182
Preferred dividend accrual	102,637	105,100
Supplemental information:
Interest paid	$ 913,992	$ 828,706