Note 10 - Stockholders' Equity - Dividends (Details) $ / shares in Units, $ in Thousands	9 Months Ended
Oct. 31, 2018 USD ($) $ / shares
Dividends Declaration Date One [Member]
Record Date	Sep. 25, 2018
Payable	Oct. 02, 2018
Dividend Per Share (in dollars per share)	$ 60
Amount \| $	$ 1,374
Dividends Declaration Date One [Member] \| Common Class A [Member]
Declaration Date	Sep. 11, 2018
Dividends Declaration Date One [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.072
Dividends Declaration Date Two [Member]
Record Date	Jun. 25, 2018
Payable	Jul. 06, 2018
Dividend Per Share (in dollars per share)	$ 60
Amount \| $	$ 1,372
Dividends Declaration Date Two [Member] \| Common Class A [Member]
Declaration Date	Jun. 11, 2018
Dividends Declaration Date Two [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.072
Dividend Declaration Date Three [Member]
Record Date	Apr. 24, 2018
Payable	May 01, 2018
Dividend Per Share (in dollars per share)	$ 60
Amount \| $	$ 1,359
Dividend Declaration Date Three [Member] \| Common Class A [Member]
Declaration Date	Apr. 10, 2018
Dividend Declaration Date Three [Member] \| Common Class B [Member]
Dividend Per Share (in dollars per share)	$ 0.072

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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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