Note 11 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 01, 2019	Dec. 01, 2019	Dec. 04, 2018
Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member]
Restructuring and Related Cost, Expected Cost Remaining	$ 300	$ 300
Electronics Business [Member] | Discontinued Operations, Disposed of by Sale [Member]
Disposal Group, Including Discontinued Operation, Consideration			$ 145,000
Disposal Group, Including Discontinued Operation, Transition Costs and Taxes		$ 231
Electronics Business [Member] | Discontinued Operations, Disposed of by Sale [Member] | AGC [Member]
Disposal Group, Including Discontinued Operation, Settlement Payment	$ 288