Consolidated Statements of Comprehensive Earnings (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Nov. 29, 2015	Nov. 30, 2014	Nov. 29, 2015	Nov. 30, 2014
Gains on Marketable Securities [Member]
Unrealized gains on marketable securities:
Unrealized holding gains (losses) arising during the period	$ 70,000	$ 84,000	$ 99,000	$ 116,000
Less: reclassification adjustment for gains (losses) included in net earnings	(11,000)	(8,000)	(17,000)	(13,000)
Losses on Marketable Securities [Member]
Unrealized gains on marketable securities:
Unrealized holding gains (losses) arising during the period	(264,000)	(7,000)	(335,000)	(16,000)
Less: reclassification adjustment for gains (losses) included in net earnings	33,000	5,000	36,000	6,000
Net earnings	4,109,000	2,031,000	13,455,000	15,202,000
Foreign currency translation	28,000	(77,000)	91,000	(153,000)
Other comprehensive loss	(144,000)	(3,000)	(126,000)	(60,000)
Total comprehensive earnings	$ 3,965,000	$ 2,028,000	$ 13,329,000	$ 15,142,000