Note 13 - Mergers and Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	May 18, 2015	Dec. 31, 2014	May 30, 2014
Goodwill			$ 307,677		$ 219,953
ESPCT [Member]
Current assets				$ 5,822
Property, plant and equipment				2,529
Goodwill				24,219
Other intangible assets				5,173
Total assets acquired				37,743
Current liabilities				1,927
Deferred income taxes				2,067
Other liabilities				276
Total liabilities assumed				4,270
Net assets acquired		$ 33,500		$ 33,473
Tiger [Member]
Current assets						$ 3,851
Property, plant and equipment						8,176
Goodwill						14,671
Other intangible assets						17,340
Total assets acquired						44,038
Current liabilities						1,223
Deferred income taxes						8,556
Other liabilities						1,015
Total liabilities assumed						10,794
Net assets acquired						$ 33,244