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Note 15 - Information of Business Segments - Reconciliation of Operating Profit (Loss) From Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 29, 2016	Feb. 25, 2018	Feb. 26, 2017	Feb. 28, 2016
Net sales	$ 27,804	$ 26,139	$ 29,836	$ 27,417	$ 27,599	$ 26,462	$ 29,058	$ 31,490	$ 111,196	$ 114,609	$ 145,855
Total Segment Income									2,066	9,989	21,006
Income Before Income Taxes									1,130	10,261	20,498
Operating Segments [Member]
Total Segment Income									18,400	20,913	32,931
Segment Reconciling Items [Member]
Corporate and Other Expenses									(7,113)	(7,301)	(7,832)
Net Interest Income (Expense)									550	272	(216)
									(17,270)	(10,652)	(12,433)
Electronics [Member] \| Operating Segments [Member]
Net sales									70,966	82,517	107,009
Total Segment Income									8,171	14,020	25,573
Electronics [Member] \| Segment Reconciling Items [Member]
Depreciation									(1,091)	(1,413)	(1,635)
Non-recurring Costs									(4,781)
Aerospace [Member] \| Operating Segments [Member]
Net sales									40,230	32,092	38,846
Total Segment Income									10,229	6,893	7,358
Aerospace [Member] \| Segment Reconciling Items [Member]
Depreciation									(1,764)	(1,751)	(1,745)
Other Segments [Member] \| Segment Reconciling Items [Member]
Depreciation									(104)	(146)	(178)
Non-recurring Costs									$ (2,967)	$ (313)	$ (827)