Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 212,434	$ 165,547
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,222,574	674,993
Decrease (Increase) in deferred tax asset	54,550	28,650
Stock based compensation		26,712
Changes in trade accounts receivable	2,486,129	425,164
Changes in related party receivable	(22,142)	(17,274)
Changes in inventory	8,953	(880,085)
Changes in prepaid expenses	(157,932)	(94,643)
Changes in accounts payable and accrued expenses	239,547	1,271,997
Net cash provided by operating activities	4,044,113	1,601,061
Cash Flows from Investing Activities:
Purchase of property and equipment	(2,095,073)	(540,374)
Cash Flows from Financing Activities:
Proceeds from revolving loan		650,000
Payments on long-term debt and capitalized lease	(1,619,936)	(983,244)
Payments on revolving loan	(275,000)	(300,000)
Debt issue costs	(64,000)
Proceeds from exercised stock options	57,000	57,000
Dividends paid on preferred stock	(172,813)	(162,945)
Dividends paid by variable interest entity	(102,000)	(102,000)
Net cash used in financing activities	(2,176,749)	(841,189)
Net Increase (Decrease) in Cash	(227,709)	219,498
Cash, beginning of period	897,377	598,887
Cash, end of period	669,668	818,385
Non-Cash Activities:
Acquisition of equipment pursuant to capital lease	5,450,474
Conversion of accrued interest to long-term debt	2,475,690
Warrants issued	120,000
Preferred dividend accrual	56,404	54,315
Supplemental Information:
Interest paid	$ 527,800	$ 236,755