Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Cash Flows from Operating Activities:
Net income	$ 2,246,908	$ 836,134
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	2,772,465	1,555,283
Decrease in deferred tax asset	1,002,267	495,555
Stock based compensation		53,424
Increase in trade accounts receivable	(1,224,120)	(1,936,952)
Decrease (increase) in related party receivable	76,535	(80,023)
Decrease (increase) in inventory	(283,057)	124,849
Increase in prepaid expenses	(66,137)	(50,009)
Increase in accounts payable and accrued expenses	1,726,444	1,916,804
Net cash provided by operating activities	6,251,305	2,915,065
Cash Flows from Investing Activities:
Purchase of property and equipment	(2,698,665)	(4,323,131)
Cash Flows from Financing Activities:
Proceeds from long-term debt		2,530,072
Proceeds from revolving loan	860,000	1,675,000
Payments on long-term debt and capitalized lease	(3,720,951)	(1,725,631)
Payments on related party note payable	(72,335)
Payments on revolving loan	(275,000)	(300,000)
Payments for debt issue costs	(130,000)
Proceeds from exercised stock options	57,000	57,000
Dividends paid on preferred stock	(376,101)	(325,885)
Distrubutions paid by variable interest entity	(213,609)	(204,000)
Net cash provided by (used in) financing activities	(3,870,996)	1,706,556
Net Increase (Decrease) in Cash	(318,356)	298,490
Cash, beginning of year	897,377	598,887
Cash, end of year	$ 579,021	$ 897,377