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Note H - Weighted Average Shares Outstanding (Tables) | 9 Months Ended
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Jan. 31, 2013
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Weighted average shares outstanding-basic |  |  | 9,017,613 |  |  |  | 9,610,125 |  |  |  | 9,142,296 |  |  |  | 9,886,100 |
Dilutive options and restricted stock |  |  | 433,860 |  |  |  | 388,165 |  |  |  | 451,558 |  |  |  | 333,696 |
Weighted average shares outstanding-diluted |  |  | 9,451,473 |  |  |  | 9,998,290 |  |  |  | 9,593,854 |  |  |  | 10,219,796 |
Antidilutive securities not included: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options |  |  | 45,000 |  |  |  | 35,000 |  |  |  | 41,667 |  |  |  | 28,333 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration