Note 2 - Discontinued Operations - Gains Losses and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Net sales		$ 11,615	$ 6,787	$ 22,805
Cost of sales		8,883	6,485	17,836
Selling, general and administrative expenses		2,503	2,438	4,889
Other income, net		(18)		(22)
Interest expense, net			10
Loss on sale of assets			(865)
Loss from discontinued operations before income taxes		247	(3,011)	102
Income tax (benefit) expense		(2)		(3)
Loss from discontinued operation, net of taxes		$ 249	(3,011)	$ 105
Cash					$ 975
Accounts receivable, net					3,146
Inventory					23,231
Prepaid expenses and other current assets					541
Property, plant and equipment, net, of discontinued operations					1,449
Other assets					2,128
Total assets					31,470
Accounts payable and other liabilities	3		3		9,252
Accrued salaries, wages, and benefits					1,716
Deferred revenue					500
Other accrued expenses	50		50		1,179
Deferred compensation					4,101
Supplemental retirement plan					1,701
Other long-term liabilities					976
Total liabilities	53		53		19,425
Net (liabilities) assets	$ (53)		$ (53)		$ 12,045