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Note 5 - Preferred and Common Stock (Tables)

12 Months Ended

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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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

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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

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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

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-Paragraph 2

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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