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Note 7 - Shareholder's Equity - Declared Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Jan. 22, 2018	May 08, 2017	May 09, 2016
Per Share Dividend (in dollars per share)		$ 0.25	$ 0.20	$ 0.19
May 8, 2017 [Member]
Declaration Date	May 08, 2017
Per Share Dividend (in dollars per share)	$ 0.20
Record Date	May 19, 2017
Total Amount	$ 4,105
Payment Date	May 26, 2017
July 24, 2017 [Member]
Declaration Date	Jul. 24, 2017
Per Share Dividend (in dollars per share)	$ 0.20
Record Date	Aug. 07, 2017
Total Amount	$ 4,121
Payment Date	Aug. 18, 2017
October 23, 2017 [Member]
Declaration Date	Oct. 23, 2017
Per Share Dividend (in dollars per share)	$ 0.20
Record Date	Nov. 06, 2017
Total Amount	$ 4,121
Payment Date	Nov. 17, 2017
January 22, 2018 [Member]
Declaration Date	Jan. 22, 2018
Per Share Dividend (in dollars per share)	$ 0.25
Record Date	Feb. 05, 2018
Total Amount	$ 5,150
Payment Date	Feb. 16, 2018

X

- Definition

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

+ References

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-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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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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-Topic 230
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-Section 50
-Paragraph 3
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
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-Topic 230
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