Note 1 - General (Details) - Business Acquisitions - Continued Purchase Price Allocation (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended
	Jun. 30, 2013		Apr. 30, 2012	Mar. 31, 2013 Payables [Member] Fyfe Asia [Member]	Mar. 31, 2013 Fyfe Asia [Member]
Note 1 - General (Details) - Business Acquisitions - Continued Purchase Price Allocation [Line Items]
Total identifiable net assets			$ 20,136		$ 20,342
Goodwill	272,294		20,008		19,802
Change in goodwill related to acquisitions	200			206	206
Total identifiable net assets			20,136		20,136
Goodwill	$ 270,525	[1]	$ 20,008		$ 20,008

[1] The Company does not have any accumulated impairment charges.