Note 16 - Acquisition - Identified Intangible Assets Acquired (Details) - Atlas Lighting Products, Inc. [Member] $ in Thousands	Feb. 21, 2017 USD ($)
Intangible Assets Acquired	$ 34,319
Intangible Assets Acquired, Estimate Useful Life (Year)
Trade Names [Member]
Intangible Assets Acquired	$ 2,198
Intangible Assets Acquired, Estimate Useful Life (Year)	20 years
Technology-Based Intangible Assets [Member]
Intangible Assets Acquired	$ 4,838
Intangible Assets Acquired, Estimate Useful Life (Year)	10 years
Customer Relationships [Member]
Intangible Assets Acquired	$ 27,283
Intangible Assets Acquired, Estimate Useful Life (Year)	15 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration