Financial Instruments (Details 3) - USD ($) $ in Thousands	Sep. 01, 2018	Mar. 03, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 3,168	$ 2,901
Municipal and corporate bonds	539	423
Commercial paper	800	400
Total cash equivalents	3,968	3,301
Municipal and corporate bonds	12,658	8,630
Total assets at fair value	17,165	12,354
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	3,168	2,901
Municipal and corporate bonds	0	0
Commercial paper	0	0
Total cash equivalents	3,168	2,901
Municipal and corporate bonds	0	0
Total assets at fair value	3,168	2,901
Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Municipal and corporate bonds	539	423
Commercial paper	800	400
Total cash equivalents	800	400
Municipal and corporate bonds	12,658	8,630
Total assets at fair value	$ 13,997	$ 9,453