Goodwill and Intangible Assets - Components of finite-lived intangible assets acquired (Details) (USD $)	3 Months Ended
	Jan. 31, 2014	Apr. 30, 2013
Components of finite-lived intangible assets acquired
Total gross carrying amount	$ 1,559,000	$ 1,559,000
Less accumulated amortization expense	1,548,434	1,426,034
Net intangible assets	10,566	132,966
Trade Names
Components of finite-lived intangible assets acquired
Total gross carrying amount	733,000	733,000
Weighted Average Life	5 years
Customer Relationships
Components of finite-lived intangible assets acquired
Total gross carrying amount	758,000	758,000
Weighted Average Life	2 years
Noncompete Agreement
Components of finite-lived intangible assets acquired
Total gross carrying amount	$ 68,000	$ 68,000
Weighted Average Life	4 years