Note 9 - Stockholders' Equity - Dividends (Details)	9 Months Ended
Oct. 31, 2017 USD ($) $ / shares
Dividends Declaration Date One [Member]
Record Date	Sep. 26, 2017
Payable	Oct. 03, 2017
Amount \| $	$ 1,346,000
Dividends Declaration Date One [Member] \| Common Class A [Member]
Dividend Per Share (in dollars per share)	$ 0.072
Dividends Declaration Date One [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.06
Dividends Declaration Date Two [Member]
Record Date	Jun. 27, 2017
Payable	Jul. 06, 2017
Amount \| $	$ 1,344,000
Dividends Declaration Date Two [Member] \| Common Class A [Member]
Dividend Per Share (in dollars per share)	$ 0.072
Dividends Declaration Date Two [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.06
Dividend Declaration Date Three [Member]
Record Date	Apr. 25, 2017
Payable	May 02, 2017
Amount \| $	$ 1,331,000
Dividend Declaration Date Three [Member] \| Common Class A [Member]
Dividend Per Share (in dollars per share)	$ 0.072
Dividend Declaration Date Three [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.06

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=98513485&loc=d3e4304-108586

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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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