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Note 5 - Preferred and Common Stock (Tables) | 12 Months Ended
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Apr. 30, 2014
Preferred And Common Stock [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of option shares |  |  | Weighted average option exercise price |
Outstanding at April 30, 2011 |  |  | 775,109 |  |  | $ | 23.38 |
Granted |  |  | 441,000 |  |  |  | 44.39 |
Exercised |  |  | (159,600 | ) |  |  | 20.36 |
Forfeited |  |  | (3,000 | ) |  |  | 36.19 |
Outstanding at April 30, 2012 |  |  | 1,053,509 |  |  | $ | 32.59 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (198,200 | ) |  |  | 23.82 |
Forfeited |  |  | (500 | ) |  |  | 14.08 |
Outstanding at April 30, 2013 |  |  | 854,809 |  |  | $ | 34.64 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (140,785 | ) |  |  | 23.93 |
Forfeited |  |  | (2,000 | ) |  |  | 44.39 |
Outstanding at April 30, 2014 |  |  | 712,024 |  |  | $ | 36.73 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
Unvested at April 30, 2011 |  |  | 14,000 |
Granted |  |  | 38,198 |
Vested |  |  | (14,000 | )
Forfeited |  |  | - |
Unvested at April 30, 2012 |  |  | 38,198 |
Granted |  |  | 46,998 |
Vested |  |  | (14,000 | )
Forfeited |  |  | - |
Unvested at April 30, 2013 |  |  | 71,196 |
Granted |  |  | 91,650 |
Vested |  |  | (14,150 | )
Forfeited |  |  | (150 | )
Unvested at April 30, 2014 |  |  | 148,546 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] |
Risk-free interest rate |  |  | 2.14% |
Expected option life (years) |  |  | 6.11 |
Expected volatility |  |  | 37% |
Expected dividend yield |  |  | 1.58% |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
| Range of exercise prices |  |  | Number of shares |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual life (years) |
| $ | 17.64 |  |  |  | 6,000 |  |  |  | 17.64 |  |  |  | 1.0 |
|  | 20.68 – 26.92 |  |  |  | 278,024 |  |  |  | 25.34 |  |  |  | 4.4 |
|  | 44.39 |  |  |  | 428,000 |  |  |  | 44.39 |  |  |  | 7.2 |
|  |  |  |  |  | 712,024 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 weighted-average grant-date fair value of equity options or other equity instruments granted 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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