Note 5 - Stockholders' Equity (Tables)

3 Months Ended

Jul. 31, 2013

Note 5 - Stockholders' Equity (Tables) [Line Items]

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

	Three Months Ended July 31, 2013				Three Months Ended July 31, 2012
Risk-free interest rate		2.97%				2.97%
Expected life, in years		6				6
Expected volatility		82.59	-	82.61%		65.52	-	78.85%
Dividend yield		0.0%				0.0%
Forfeiture rate		11.40%				9.70%

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

Stock Options	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contract Life
Outstanding options at April 30, 2013		205,500	$	4.28	6.54 Years
Granted		60,000	$	5.86	9.83 Years
Exercised		3,333	$	4.00
Forfeited		--		--
Outstanding options at July 31, 2013		262,167	$	4.64	7.10 Years
Outstanding exercisable at July 31, 2013		136,917	$	4.42	5.20 Years

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding					Options Exercisable
Range of Exercise Prices			Number Outstanding at July 31, 2013		Weighted- Average Remaining Contractual Life	Weighted- Average Exercise Price		Number Exercisable at July 31, 2013		Weighted- Average Exercise Price
$3.01	-	$4.00		125,250	5.24 years	$	3.57		80,333	$	3.69
$4.01	-	$5.00		24,167	8.81 years	$	4.35		7,500	$	4.35
$5.01	-	$6.00		115,000	8.73 years	$	5.54		38,333	$	5.21
$6.01	-	$7.00		--	--		--		--		--
$7.01	-	$8.00		10,750	5.11 years	$	7.05		10,750	$	7.05
Total				262,167	7.10 years	$	4.64		136,917	$	4.42

Restricted Stock [Member]

Note 5 - Stockholders' Equity (Tables) [Line Items]

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

Restricted Stock	Number of Shares		Weighted- Average Price
Outstanding awards at April 30, 2013		11,007	$	4.64
Granted		4,608	$	5.86
Issued		4,469	$	4.70
Forfeited		--		--
Outstanding awards at July 31, 2013		11,146	$	5.12
Outstanding vested at July 31, 2013		--		--