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Note 8 - Stockholders' Equity - Dividends Per Share (Details) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
First Quarter [Member]
Dividends paid (in dollars per share)	$ 0.16	$ 0.16	$ 0.15
Second Quarter [Member]
Dividends paid (in dollars per share)	0.16	0.16	0.15
Third Quarter [Member]
Dividends paid (in dollars per share)	0.16	0.16	0.16
Fourth Quarter [Member]
Dividends paid (in dollars per share)	$ 0.16	$ 0.16	$ 0.16

X

- 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 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

+ Details

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