Note 6 - Restructuring Charges - Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Nov. 26, 2017	Nov. 27, 2016	Nov. 26, 2017	Nov. 26, 2017	Nov. 27, 2016
Current Period Charges	$ 472	$ 113		$ 4,735	$ 206
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member]
Accrued, Beginning Balance	4,063
Current Period Charges	360		$ 4,423
Cash Payments	(1,903)
Non-Cash Charges	(67)
Accrued, Ending Balance	2,453		2,453	2,453
Total Costs Accrued to Date	4,423		4,423	4,423
Total Expected Costs	5,500		5,500	5,500
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] | Facility Lease Costs [Member]
Accrued, Beginning Balance	2,753
Current Period Charges	(4)
Cash Payments	(342)
Non-Cash Charges
Accrued, Ending Balance	2,407		2,407	2,407
Total Costs Accrued to Date	2,749		2,749	2,749
Total Expected Costs	2,749		2,749	2,749
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] | Employee Severance [Member]
Accrued, Beginning Balance	1,122
Current Period Charges	(46)
Cash Payments	(1,030)
Non-Cash Charges
Accrued, Ending Balance	46		46	46
Total Costs Accrued to Date	1,076		1,076	1,076
Total Expected Costs	1,076		1,076	1,076
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] | Equipment Removal [Member]
Accrued, Beginning Balance
Current Period Charges
Cash Payments
Non-Cash Charges
Accrued, Ending Balance
Total Costs Accrued to Date
Total Expected Costs	700		700	700
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] | Other Restructuring [Member]
Accrued, Beginning Balance	188
Current Period Charges	410
Cash Payments	(531)
Non-Cash Charges	(67)
Accrued, Ending Balance
Total Costs Accrued to Date	598		598	598
Total Expected Costs	$ 975		$ 975	$ 975