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Note I - Stock Based Compensation (Tables)

9 Months Ended

Jan. 31, 2015

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				November 20, 2024
Shares available for grant at January 31, 2015			-				278,500

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Nine Months Ended January 31,
		2015				2014
Expected term (years)			5.4				5.0
Risk-free interest rate			1.64	%			0.67	%
Volatility			34	%			50	%
Dividend yield			-				-

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

		Nine Months Ended January 31,
(Dollars in thousands)		2015				2014
Options Exercised			153,250				30,500
Cash Received from Option Exercises		$	2,927			$	719
Intrinsic Value of Options Exercised		$	4,026			$	563

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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)

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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

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