Note 6 - Stock-based Compensation (Detail) - Stock option activity (USD $)	6 Months Ended
	Sep. 30, 2012	Oct. 02, 2011
Outstanding at Beginning of Period (in Dollars per share)	$ 3.57	$ 3.31
Outstanding at Beginning of Period	573,000	747,000
Granted (in Dollars per share)	$ 5.42	$ 4.81
Granted	110,000	100,000
Exercised (in Dollars per share)	$ 3.12	$ 3.24
Exercised	(296,250)	(193,500)
Forfeited (in Dollars per share)	$ 0.71
Forfeited	(1,250)
Outstanding at End of Period (in Dollars per share)	$ 4.46	$ 3.56
Outstanding at End of Period	385,500	653,500
Exercisable at End of Period (in Dollars per share)	$ 3.91	$ 3.24
Exercisable at End of Period	225,500	503,500