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Note 7 - Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2015

Stockholders' Equity Note [Abstract]

Dividends Declared [Table Text Block]

		Year Ended March 31,
		2015				2014				2013
First quarter		$	0.15			$	0.14			$	0.13
Second quarter			0.15				0.14				0.13
Third quarter			0.16				0.15				0.14
Fourth quarter			0.16				0.15				0.14

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- Definition

Tabular disclosure of information related to dividends declared, including paid and unpaid dividends.

+ References

No definition available.

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Period Type:	duration

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- Details

Name:	us-gaap_StockholdersEquityNoteAbstract
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Balance Type:	na
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