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Note 1 - Schedule of Fair Value Measurements of Investments (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	$ 12,037,000	$ 5,272,000
Available-for-sale Securities	3,637,000	9,632,000
	15,674,000	14,904,000
Fair Value, Inputs, Level 2 [Member]
Cash and Cash Equivalents, Fair Value Disclosure
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member]
Cash and Cash Equivalents, Fair Value Disclosure
Available-for-sale Securities
Cash and Cash Equivalents, Fair Value Disclosure	12,037,000	5,272,000
Available-for-sale Securities	3,637,000	9,632,000
	$ 15,674,000	$ 14,904,000

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Fair value portion 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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