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Note 7 - Stockholders' Equity (Tables) | 12 Months Ended
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Mar. 31, 2015
Stockholders' Equity Note [Abstract] |
Dividends Declared [Table Text Block] |
|  | Year E nded March 31, |
|  | 2015 |  |  | 201 4 |  |  | 201 3 |
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. + Details
Name: | us-gaap_DividendsDeclaredTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration