Long-Term Debt (Details) (USD $)			0 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended		12 Months Ended				1 Months Ended			1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Aug. 14, 2012 Term loan agreement, maturing on August 14, 2032	Mar. 31, 2013 Term loan agreement, maturing on August 14, 2032	Mar. 31, 2013 Term loan agreement, maturing on August 14, 2032 Minimum	Aug. 14, 2012 Term loan agreement, promissory note one	Aug. 14, 2012 Term loan agreement, promissory note two	Mar. 31, 2013 Equipment loans with John Deere item	Mar. 31, 2012 Equipment loans with John Deere	Mar. 31, 2013 Equipment loans with John Deere Maximum item	Mar. 31, 2013 Term loan agreement with John Deere, maturing in May, 2015	Mar. 31, 2013 Term loan agreement with John Deere, maturing in November, 2015	Mar. 31, 2013 Term loan agreement with John Deere, maturing in June, 2016	Sep. 30, 2011 Term loan agreement with Nissan Motor Acceptance Corporation, maturing on September 13, 2016 item	Mar. 31, 2013 Term loan agreement with Nissan Motor Acceptance Corporation, maturing on September 13, 2016	Mar. 31, 2012 Term loan agreement with Nissan Motor Acceptance Corporation, maturing on September 13, 2016	Mar. 31, 2010 Capital lease item	Mar. 31, 2013 Capital lease	Mar. 31, 2012 Capital lease
Long-term debt
Total principal payments	$ 5,582,000	$ 634,000		$ 5,500,000				$ 66,000			$ 23,000	$ 19,000	$ 24,000					$ 0	$ 34,000
Less current maturities	(128,000)	(234,000)
Long-term debt, excluding current maturities	5,454,000	400,000
Amount borrowed			5,500,000			2,250,000	3,250,000	103,000						23,000			97,000
Period for which interest is payable				12 months
Period over which obligation fully amortizes				19 years
Reference rate (as a percent)				3.25%
Variable interest rate margin (as a percent)				1.00%
Annual interest rate (as a percent)					5.50%
Prepayment penalty (as a percent)				5.00%
Reduction in prepayment penalty each year (as a percent)				1.00%
One-time origination and guaranty fees				214,500
Annual renewal fee payable (as a percent)				0.25%
Conditionally guaranteed portion of the loan (as a percent)				80.00%
Number of equal monthly payments										48				60			36
Interest rate (as a percent)								0.00%	0.00%						0.00%			6.60%
Number of equipment loans								3
Imputed interest rate (as a percent)															2.00%
Face value of term loan															15,000	20,000
Unamortized discount								$ 2,000	$ 2,000						$ 600	$ 900