Note 10 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Total current assets	$ 0	$ 3,503	[1]
Total assets	0	3,618
Total current liabilities	0	599	[1]
Noncurrent liabilities	$ 0	24	[1]
Fixtures Services Business FSG [Member] | Discontinued Operations, Held-for-sale [Member]
Cash and cash equivalents		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

[1] Derived from December 28, 2019 audited financial statements