Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Cash Flows from Operating Activities:
Net income	$ 1,277,759	$ 914,939
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	995,749	867,005
Deferred income taxes	(237,400)	0
Stock-based compensation	40,068	0
Changes in receivables	(319,569)	(294,002)
Changes in inventory	(152,669)	(1,339,103)
Changes in prepaid expenses and other	(109,302)	(82,994)
Changes in other assets	2,484	(3,320)
Changes in accounts payable and accrued expenses	15,273	1,500,827
Net cash provided by operating activities	1,512,393	1,563,352
Cash Flows from Investing Activities:
Purchase of property and equipment	(320,651)	(435,211)
Cash Flows from Financing Activities:
Payments on long-term debt and capitalized leases	(939,014)	(935,964)
Payments on advances from related party	0	(93,500)
Capital contributions to variable interest entity	0	75,000
Distributions by variable interest entity	(65,306)	(54,560)
Net cash used in financing activities	(1,004,320)	(1,009,024)
Net Increase in Cash	187,422	119,117
Cash, beginning of period	194,400	169,420
Cash, end of period	381,822	288,537
Non-Cash Activities:
Acquisition of equipment by capital lease	0	563,026
Preferred dividend accrual	244,863	160,274
Net decrease in liabilities due to deconsolidation of VIE	0	990,378
Supplemental Information:
Interest paid	$ 329,737	$ 398,523