Note 10 - Discontinued Operations - Restructuring Charges (Details) - Consolidation of Nelco Products, Inc. and Neltec, Inc. [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 25, 2018	Nov. 26, 2017	Nov. 25, 2018	Nov. 26, 2017
Accrued, Beginning Balance	$ 1,835
Current Period Charges	61	$ 360	$ 231	$ 4,423
Cash Payments	(316)
Non-Cash Charges
Accrued, Ending Balance	1,580		1,580
Total Costs Accrued to Date	4,659		4,659
Total Expected Costs	5,500		5,500
Facility Lease Costs [Member]
Accrued, Beginning Balance	1,835
Current Period Charges	18
Cash Payments	(273)
Non-Cash Charges
Accrued, Ending Balance	1,580		1,580
Total Costs Accrued to Date	2,818		2,818
Total Expected Costs	2,818		2,818
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	43
Cash Payments	(43)
Non-Cash Charges
Accrued, Ending Balance
Total Costs Accrued to Date	760		760
Total Expected Costs	$ 901		$ 901