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Note 7 - Stockholders' Equity (Details) - Dividends per Share (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
First Quarter [Member]
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items]
Dividend paid per share	$ 0.14	$ 0.13	$ 0.12
Second Quarter [Member]
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items]
Dividend paid per share	$ 0.14	$ 0.13	$ 0.12
Third Quarter [Member]
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items]
Dividend paid per share	$ 0.15	$ 0.14	$ 0.13
Fourth Quater [Member]
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items]
Dividend paid per share	$ 0.15	$ 0.14	$ 0.13

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- Details

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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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