Note 10 - Discontinued Operations - Restructuring Charges (Details) - Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 26, 2018	Aug. 27, 2017	Aug. 26, 2018	Aug. 27, 2017
Accrued, Beginning Balance	$ 1,965
Current Period Charges	117	$ 2,813	$ 169	$ 4,063
Cash Payments	(247)
Non-Cash Charges
Accrued, Ending Balance	1,835		1,835
Total Costs Accrued to Date	4,598		4,598
Total Expected Costs	5,500		5,500
Facility Lease Costs [Member]
Accrued, Beginning Balance	1,965
Current Period Charges	51
Cash Payments	(181)
Non-Cash Charges
Accrued, Ending Balance	1,835		1,835
Total Costs Accrued to Date	2,800		2,800
Total Expected Costs	2,800		2,800
Employee Severance [Member]
Accrued, Beginning Balance
Current Period Charges
Cash Payments
Non-Cash Charges
Accrued, Ending Balance
Total Costs Accrued to Date	1,081		1,081
Total Expected Costs	1,081		1,081
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
Other Restructuring [Member]
Accrued, Beginning Balance
Current Period Charges	66
Cash Payments	(66)
Non-Cash Charges
Accrued, Ending Balance
Total Costs Accrued to Date	717		717
Total Expected Costs	$ 919		$ 919