Note I - Stock Based Compensation (Tables)

3 Months Ended

Jul. 31, 2012

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 24, 2022
Shares available for grant at July 31, 2012		-		402,500

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

	July 31, 2012			July 31, 2011
Expected term (years)		5.0			5.0
Risk-free interest rate		0.82	%		1.77	%
Volatility		50	%		50	%
Dividend yield		—			—