Note 4 - Marketable Securities (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 24, 2012
Table Text Block [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (77,000)	$ (29,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (50,000)	$ (20,000)