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Note I - Stock-based Compensation (Tables)

6 Months Ended

Oct. 31, 2016

Notes Tables

Stock Option Plan Comparison [Table Text Block]

		1997 Plan				Restated Option 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				August 10, 2026
Shares available for grant at October 31, 2016			-				276,500

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

		Six Months Ended October 31,
		2016				2015
Expected term (years)			5.5				5.5
Risk-free interest rate			1.28	%			1.58	%
Volatility			36	%			34	%
Dividend yield			-				-

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

		Six Months Ended October 31,
(Dollars in thousands)		2016				2015
Options exercised			57,500				17,750
Cash received from option exercises		$	860			$	245
Intrinsic value of options exercised		$	1,335			$	690

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+ 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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