Note 10 - Recently Issued Accounting Pronouncements (Details Textual) $ in Millions	3 Months Ended
Apr. 01, 2018 USD ($)
Relcassification From Selling, General and Administrative Expenses to Other Expenses [Member] \| Quarter Ended April 02, 2017 [Member]
Prior Period Reclassification Adjustment	$ 0.5

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration