Financial Instruments (Details 3) - USD ($) $ in Thousands	Dec. 01, 2018	Mar. 03, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 2,145	$ 2,901
Municipal and corporate bonds	442	423
Commercial paper	400	400
Total cash equivalents	2,545	3,301
Municipal and corporate bonds	11,847	8,630
Total assets at fair value	14,834	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	2,145	2,901
Municipal and corporate bonds	0	0
Commercial paper	0	0
Total cash equivalents	2,145	2,901
Municipal and corporate bonds	0	0
Total assets at fair value	2,145	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	442	423
Commercial paper	400	400
Total cash equivalents	400	400
Municipal and corporate bonds	11,847	8,630
Total assets at fair value	$ 12,689	$ 9,453