Note 11 - Warranty Accrual (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Product Warranties Disclosures [Abstract]
Product Warranty Accrual, Period Increase (Decrease)	$ 0.5	$ (0.2)	$ 2.6

Total increases or decreases in the standard and extended product warranty liability during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

Name:	us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration