Note 10 - Goodwill and Other Intangible Assets (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015 USD ($)	Mar. 31, 2015	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Number of Businesses Acquired	1	4	2	5
Goodwill, Gross	$ 7,900,000		$ 8,100,000	$ 7,900,000
Finite-Lived Intangible Assets, Period Increase (Decrease)			90,000
Finite-lived Intangible Assets Acquired			150,000
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)			4,000
Amortization of Intangible Assets			64,000	$ 54,000	$ 33,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			68,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four			65,000
Other Segments [Member]
Goodwill, Impairment Loss	$ 29,000
Optical Communications [Member]
Business Combination, Consideration Transferred			356,000
Goodwill, Impaired, Accumulated Impairment Loss			$ 6,500,000