Long-term Liabilities (Detail) (USD $)	1 Months Ended			12 Months Ended		1 Months Ended
	Mar. 31, 2011	Sep. 30, 2009	Mar. 31, 2009	May 31, 2013	Jun. 01, 2012	Jan. 31, 2010 Vehicles [Member] Vehicle
Debt Disclosure [Line Items]
Construction line of credit, fixed interest rate			4.25%
Equipment note, term	15 years	10 years
Equipment note, interest rate	3.52%	4.25%
Equipment note, face amount	$ 2,900,000	$ 4,000,000
Equipment note, remaining balance	3,532,700			5,671,240	6,015,767
Number of asset units under capital lease						5
Capital lease, term						4 years
Capital lease, annual interest rate						3.69%
Compensation expense				$ 131,804	$ 67,337