Financing Agreements Schedule of Debt (Details) (USD $)	6 Months Ended
	Oct. 31, 2014
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (500,000)
Notes Payable to Banks [Member] | Loan Series 1 [Member]
Debt Instrument [Line Items]
Proceeds Received	380,000
Amount Paid	304,000
Long-term Debt	76,000
Debt Instrument, Interest Rate, Stated Percentage	4.63%
Debt Instrument, Maturity Date	Sep. 26, 2015
Debt Instrument, Periodic Payment	7,123
Additional Debt Disclosure	Advance rate equal to 80% of the price of the equipment purchased
Notes Payable to Banks [Member] | Loan Series 2 [Member]
Debt Instrument [Line Items]
Proceeds Received	100,000
Amount Paid	12,000
Long-term Debt	88,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Debt Instrument, Maturity Date	May 27, 2018
Debt Instrument, Periodic Payment	2,269
Additional Debt Disclosure	Advance rate equal to 80% of the price of the equipment purchased
Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	(500,000)
Proceeds Received	0
Amount Paid	0
Short-term Debt	0
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Debt Instrument, Maturity Date	Sep. 27, 2015
Debt Instrument, Periodic Payment	0
Additional Debt Disclosure	Borrowing base limited to 75% of eligible receivables
Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	(542,000)
Proceeds Received	542,000
Amount Paid	24,000
Long-term Debt	518,000
Debt Instrument, Interest Rate, Stated Percentage	4.05%
Debt Instrument, Maturity Date	Jan. 27, 2019
Debt Instrument, Periodic Payment	$ 4,873
Additional Debt Disclosure	15 year amortization schedule