Note 5 - Exit and Disposal Activities - Costs and Related Restructuring Reserves (Details) - Transition of Production from the Broadway Plant [Member] $ in Thousands	9 Months Ended
	Oct. 01, 2017 USD ($)
Accrued, Beginning Balance	$ 427
Charge	2,235
Cash Payments or Asset Write-Offs	(2,256)
Accrued, Ending Balance	406
Employee Severance [Member]
Accrued, Beginning Balance	427
Charge	1,017
Cash Payments or Asset Write-Offs	(1,038)
Accrued, Ending Balance	406
Equipment Relocation Costs [Member]
Accrued, Beginning Balance	0
Charge	1,218
Cash Payments or Asset Write-Offs	(1,218)
Accrued, Ending Balance	$ 0