Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Cash Flows from Operating Activities:
Net income	$ 105,727	$ 31,437
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,043,365	1,054,118
Increase in deferred tax asset	(39,100)	(71,955)
Stock based compensation	40,068	40,068
Changes in trade accounts receivable	(82,097)	1,386,863
Changes in related party receivable	(23,492)	(256,425)
Changes in inventory	(2,362,667)	(1,322,701)
Changes in prepaid expenses	(81,985)	41,357
Changes in accounts payable and accrued expenses	2,865,698	$ 929,419
Other	(777)
Net cash provided by operating activities	1,464,740	$ 1,832,181
Cash Flows from Investing Activities:
Purchase of property and equipment	(3,394,268)	$ (820,364)
Cash Flows from Financing Activities:
Proceeds from long-term debt	2,530,072
Proceeds from revolving loan	1,200,000	$ 600,000
Payments on long-term debt and capitalized lease	(1,249,557)	(1,425,618)
Payments on revolving loan	(300,000)	(385,000)
Proceeds from exercised stock options	57,000	114,000
Dividends paid on preferred stock	(245,631)	(218,151)
Dividends Distributions paid by variable interest entity	(153,000)	(153,000)
Net cash provided by (used in) financing activities	1,838,884	(1,467,769)
Net Decrease in Cash	(90,644)	(455,952)
Cash, beginning of period	598,887	661,263
Cash, end of period	508,243	205,311
Non-Cash Activities:
Acquisition of equipment from related party	1,137,865	$ 75,000
Decrease in related party receivable from equipment acquisition	449,569
Note payable to related party resulting from equipment acquisition	$ 688,296
Capitalized equipment lease		$ 32,249
Preferred dividend accrual	$ 890	24,931
Supplemental Information:
Interest paid	$ 351,988	$ 385,638