Note 14 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Cash	$ (0)	$ 736	$ 461
Total current assets	0	3,503
Total assets	0	3,618	$ 3,820
Total current liabilities	0	599
Noncurrent liabilities	$ 0	24
Fixtures Services Business FSG [Member] | Discontinued Operations, Held-for-sale [Member]
Cash		736
Accounts receivable, net		1,316
Inventories		1,411
Other current assets		40
Total current assets		3,503
Property, plant and equipment, net		33
Other noncurrent assets		82
Total assets		3,618
Other accrued current liabilities		599
Total current liabilities		599
Noncurrent liabilities		24
Total liabilities		$ 623