Note I - Stock Based Compensation (Tables)

3 Months Ended

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