Note 15 - Selected Quarterly Financial Data (Unaudited) (Details Textual) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016
Legal Fees	$ 1.2	$ 0.9	$ 0.1	$ 0.4		$ 0.1	$ 0.9	$ 1.7	$ 1.2
Business Combination, Acquisition Related Costs	3.2	5.9	6.1	6.2		4.0	0.3	0.2	0.2
Other Nonrecurring (Income) Expense	0.3	0.5	6.9			0.3	0.1
Asset Impairment Charges		$ 14.8
Premium Refund of Annuity Contract					$ 0.3	0.3				$ 0.3
Defined Benefit Plan, Settlements, Benefit Obligation							30.8	0.7	0.7
Facility Relocation [Member]
Restructuring Charges	$ 0.1		0.7	1.0		$ 2.1	$ 1.2	$ 0.9	$ 1.0
Facility Closing [Member]
Restructuring Charges			$ 0.3	$ 1.6