Note I - Stock Based Compensation (Tables)

6 Months Ended

Oct. 31, 2013

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 6, 2023
Shares available for grant at October 31, 2013	-	367,500

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

	October 31, 2013			October 31, 2012
Expected term (years)		5.0		5.0
Risk-free interest rate		0.67	%	0.78	%
Volatility		50	%	50	%
Dividend yield		—		—

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

	Six Months Ended October 31,
(Dollars in thousands)	2013		2012
Options Exercised		4,500		25,000
Cash Received from Option Exercises	$	105	$	584
Intrinsic Value of Options Exercised	$	91	$	548