Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2015 (USD $)	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2015 [Line Items]
Goodwill	$ 490,007,000	[1]	$ 495,679,000	[1]
2015 Acquisitions [Member] | Customer Relationships [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2015 [Line Items]
Finite-lived intangible assets	1,080,000
2015 Acquisitions [Member] | Trade Names [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2015 [Line Items]
Finite-lived intangible assets	270,000
2015 Acquisitions [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price, 2015 [Line Items]
Equipment and leasehold improvements	22,000
Goodwill	807,000
Assets acquired and liabilities assumed, net	120,000
Total	$ 2,299,000

[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.