Note 2 - Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) (USD $)	Oct. 31, 2014	Apr. 30, 2014
Cash and cash equivalents	$ 6,238,708	$ 13,858,659
Money Market Funds [Member]
Cash and cash equivalents	2,042,385	441,715
Certificates of Deposits and US Treasury Obligations [Member]
Cash and cash equivalents	847,039	11,499,768
Checking and Savings Accounts [Member]
Cash and cash equivalents	$ 3,349,284	$ 1,917,176

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References+ Details