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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Common Stock [Member]
Common stock, shares returned as payment (in shares)	4,853	8,562	13,964
Retained Earnings [Member]
Dividends paid, per share (in dollars per share)	$ 0.64	$ 0.64	$ 0.64

X

- Definition

Represents shares returned as payment for stock options exercised and converted into shares of common stock.

+ References

No definition available.

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X

- Definition

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

+ 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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