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Note I - Stock Based Compensation (Tables) | 3 Months Ended
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Jul. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Option Plan Comparison [Table Text Block] |
| 1997 Plan |  | 2007 Plan
Minimum exercise price as a percentage of fair market value at date of grant | 100% |  | 100%
Last expiration date for outstanding options | July 2, 2017 |  | May 1, 2024
Shares available for grant at July 31, 2014 | - |  | 347,500
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended July 31, |
|  | 2014 |  |  | 2013 |
Expected term (years) |  |  | 5.0 |  |  |  | 5.0 |
Risk-free interest rate |  |  | 1.66 | % |  |  | 0.67 | %
Volatility |  |  | 35 | % |  |  | 50 | %
Dividend yield |  |  | - |  |  |  | - |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Three Months Ended July 31, |
(Dollars in thousands) |  | 2014 |  |  | 2013 |
Options Exercised |  |  | 16,750 |  |  |  | 1,500 |
Cash Received from Option Exercises |  | $ | 268 |  |  | $ | 35 |
Intrinsic Value of Options Exercised |  | $ | 347 |  |  | $ | 34 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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