Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Cash Flows from Operating Activities:
Net income (loss)	$ 475,360	$ (417,642)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	276,509	272,246
Stock-based compensation	0	23,992
Changes in receivables	295,536	392,018
Changes in inventory	(674,027)	(264,189)
Changes in prepaid expenses and other	31,467	16,861
Change in other assets	690	(3,750)
Changes in accounts payable and accrued expenses	268,462	481,241
Net cash provided by operating activities	673,997	500,777
Cash Flows from Investing Activities:
Purchase of property and equipment	(183,390)	(192,724)
Cash Flows from Financing Activities:
Payments on long-term debt	(271,827)	(97,208)
Payments on advances from related party	(34,500)	(126,501)
Payments on long-term debt of variable interest entities	(93,232)	(13,447)
Capital contributions to variable interest entity	75,000	0
Distributions by variable interest entity	(18,112)	0
Net cash used in financing activities	(342,671)	(237,156)
Net Increase in Cash	147,936	70,897
Cash, beginning of period	169,420	163,749
Cash, end of period	317,356	234,646
Non-Cash Activities:
Acquisition of equipment by capital lease or debt	563,026	390,000
Preferred dividend accrual	0	81,918
Supplemental Information:
Interest paid	$ 159,995	$ 100,310