Debt narrative (Details) (USD $)			0 Months Ended	6 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Sep. 24, 2010 Bank of America [Member] Revolving Credit Facility [Member] Y	Mar. 31, 2013 Bank of America [Member] Revolving Credit Facility [Member]	Apr. 01, 2012 Bank of America [Member] Revolving Credit Facility [Member]
Line of Credit Facility, Amount Outstanding	$ 6,742,647	$ 6,742,647
Line of Credit Facility, Maximum Borrowing Capacity			30,000,000
Line of Credit Facility, Interest Rate at Period End			1.75%	2.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage				0.25%
Interest Expense, Debt, Excluding Amortization				96,000	133,000
Line of Credit Facility, Increase, Additional Borrowings			20,000,000
Line of Credit Facility, Remaining Borrowing Capacity				23,300,000
Prior Amount Of Long Term Debt Paid By Current Line Of Credit Facility			13,200,000
Debt Instrument Term			3
Aggregate Total Borrowing Capacity			$ 50,000,000