Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Goodwill	[1]	$ 495,679	$ 369,312	$ 508,297
Acquisitions 2013 [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Equipment and leasehold improvements		130
Goodwill		2,715
Assets acquired and liabilities assumed, net		624
Totals		7,320
Acquisitions 2013 [Member] | Scenario, Previously Reported [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Equipment and leasehold improvements			130
Goodwill			3,024
Assets acquired and liabilities assumed, net			688
Totals			7,693
Acquisitions 2013 [Member] | Scenario, Adjustment [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Goodwill			(309)
Assets acquired and liabilities assumed, net			(64)
Totals			(373)
Customer Relationships [Member] | Acquisitions 2013 [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Intangible assets		3,141
Customer Relationships [Member] | Acquisitions 2013 [Member] | Scenario, Previously Reported [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Intangible assets			3,141
Trade Names [Member] | Acquisitions 2013 [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Intangible assets		$ 710
Trade Names [Member] | Acquisitions 2013 [Member] | Scenario, Previously Reported [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2013 [Line Items]
Intangible assets			$ 710

[1] Goodwill recorded in connection with certain tax benefits to be realized in the Company's U.S. income tax returns has been reflected in the United States segment.