Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 1,584,878	$ 966,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	337,236	334,385
Deferred income taxes	(253,000)	(208,900)
Stock-based compensation	13,356	13,356
Changes in receivables	(178,178)	329,111
Changes in inventory	(212,629)	109,796
Changes in prepaid expenses and other	(101,744)	(76,799)
Change in other assets	1,834	2,290
Changes in accounts payable and accrued expenses	29,742	61,591
Net cash provided by operating activities	1,221,495	1,531,597
Cash Flows from Investing Activities:
Purchase of property and equipment	(510,928)	(362,677)
Cash Flows from Financing Activities:
Payments on long-term debt and capitalized leases	(325,084)	(320,077)
Payments on advances from related party	(34,500)
Distributions by variable interest entity		(22,782)
Net cash used in financing activities	(359,584)	(342,859)
Net Increase in Cash	350,983	826,061
Cash, beginning of period	366,896	194,400
Cash, end of period	717,879	1,020,461
Non-Cash Activities:
Preferred dividend accrual	81,918	82,808
Supplemental Information:
Interest paid	$ 85,689	$ 108,431