Note I - Stock Based Compensation (Tables)

9 Months Ended

Jan. 31, 2013

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	October 9, 2022
Shares available for grant at January 31, 2013	-	392,500

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

	January 31, 2013	January 31, 2012
Expected term (years)	5.0	5.0
Risk-free interest rate	0.78%	1.59%
Volatility	50%	50%
Dividend yield	—	—

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

	Nine Months Ended January 31,
(Dollars in thousands)	2013		2012
Options Exercised		28,500		86,897
Cash Received from Option Exercises	$	665	$	1,355
Intrinsic Value of Options Exercised	$	603	$	1,456