Note 13 - Discontinued Operations - Balance Sheet Information for Fixture Services Business (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Cash	$ 736	$ 461
Total current assets	3,503	3,741
Discontinued operations	3,618	3,820
Total current liabilities	599	518
Noncurrent liabilities of discontinued operations (Note 13)	24
Fixtures Services Business FSG [Member] | Discontinued Operations, Held-for-sale [Member]
Cash	736	461
Accounts receivable, net	1,316	1,718
Inventories	1,411	1,388
Other current assets	40	174
Total current assets	3,503	3,741
Property, plant and equipment, net	33	66
Other noncurrent assets	82	13
Discontinued operations	3,618	3,820
Other accrued current liabilities	599	518
Total current liabilities	599	518
Noncurrent liabilities of discontinued operations (Note 13)	24
Total liabilities	$ 623	$ 518