Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Goodwill, Acquired During Period	[1]		$ 3,973
Goodwill, Impairment Loss		$ 0	1,389	[1]	$ 45,390
Amortization of Intangible Assets, Total		13,700	14,000		16,100
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		13,500
Finite-Lived Intangible Assets, Amortization Expense, Year Two		13,500
Finite-Lived Intangible Assets, Amortization Expense, Year Three		13,300
Finite-Lived Intangible Assets, Amortization Expense, Year Four		13,300
Finite-Lived Intangible Assets, Amortization Expense, Year Five		$ 13,300
Infrastructure Solutions [Member]
Goodwill, Acquired During Period	[1]		0
Goodwill, Impairment Loss			1,389	[1]	$ 45,400
Denmark 1 [Member] | Infrastructure Solutions [Member]
Goodwill, Impairment Loss			1,400
Hebna [Member]
Goodwill, Acquired During Period			2,700
P2S [Member]
Goodwill, Acquired During Period			$ 1,300

[1] During 2018, the Company recorded goodwill of $2.7 million and $1.3 million related to the acquisitions of Hebna and P2S, respectively (see Note 1).