Note 9 - Dividends (Details) - USD ($)	3 Months Ended
Jul. 31, 2016	Apr. 30, 2016
Dividends Declaration Date One [Member] \| Common Class A [Member]
Dividend (in dollars per share)	$ 0.072
Dividends Declaration Date One [Member] \| Common Class B [Member]
Dividend (in dollars per share)	$ 0.06
Dividends Declaration Date One [Member]
Record Date	Jun. 28, 2016
Payable	Jul. 07, 2016
Amount	$ 1,326,000
Dividends Declaration Date Two [Member] \| Common Class A [Member]
Dividend (in dollars per share)		$ 0.072
Dividends Declaration Date Two [Member] \| Common Class B [Member]
Dividend (in dollars per share)		$ 0.06
Dividends Declaration Date Two [Member]
Record Date		Apr. 26, 2016
Payable		May 03, 2016
Amount		$ 1,316,000

Date the declared dividend will be paid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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