Note 3 - Acquisition - Intangible Assets Acquired (Details) - Ambrell [Member] $ in Thousands	May 24, 2017 USD ($)
Finite-lived intangible assets	$ 10,100
Finite-lived intangible assets, weighted average estimated useful life (Year)	8 years 219 days
Total finite-lived intangible assets	$ 10,100
Identifiable intangible assets	16,300
Trademarks [Member]
Indefinite-lived intangible assets	6,200
Customer Relationships [Member]
Finite-lived intangible assets	$ 9,000
Finite-lived intangible assets, weighted average estimated useful life (Year)	9 years
Total finite-lived intangible assets	$ 9,000
Patented Technology [Member]
Finite-lived intangible assets	$ 600
Finite-lived intangible assets, weighted average estimated useful life (Year)	9 years
Total finite-lived intangible assets	$ 600
Order or Production Backlog [Member]
Finite-lived intangible assets	$ 500
Finite-lived intangible assets, weighted average estimated useful life (Year)	109 days
Total finite-lived intangible assets	$ 500