Note 3 - Acquisition - Intangible Assets Acquired (Details) - Ambrell [Member] - USD ($) $ in Thousands		6 Months Ended
	May 24, 2017	Jun. 30, 2017
Finite-lived intangible assets, weighted average estimated useful life (Year)	6 years
Finite-lived intangible assets	$ 9,500	$ 9,500
Customer Relationships [Member]
Finite-lived intangible assets, weighted average estimated useful life (Year)	6 years
Finite-lived intangible assets	$ 6,500
Patented Technology [Member]
Finite-lived intangible assets, weighted average estimated useful life (Year)	10 years
Finite-lived intangible assets	$ 1,500
Order or Production Backlog [Member]
Finite-lived intangible assets, weighted average estimated useful life (Year)	1 year
Finite-lived intangible assets	$ 1,000
Trade Names [Member]
Finite-lived intangible assets, weighted average estimated useful life (Year)	4 years
Finite-lived intangible assets	$ 500