Note 2 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Oct. 02, 2017	Dec. 31, 2018	Mar. 31, 2018
Goodwill			$ 317,676	$ 316,298
AB Electronics Sensing and Control Business [Member]
Accounts receivable		$ 61,483
Inventory		42,443
Accounts payable and accrued liabilities		(67,930)
Other current assets and liabilities, net		8,566
Working capital		44,562
Property and equipment		85,794
Intangible assets		18,168
Other non-current assets and liabilities, net		(13,806)
Total identified assets and liabilities		134,718
Purchase price		162,038
Goodwill		$ 27,320
AVX Antenna [Member]
Accounts receivable	$ 14,419
Other current assets and liabilities, net	3,613
Working capital	7,892
Property and equipment	13,769
Intangible assets	64,800
Other non-current assets and liabilities, net	(6,434)
Total identified assets and liabilities	58,922
Purchase price	127,677
Goodwill	68,755
Accounts payable	(10,140)
Debt	$ (21,105)