Note 3 - Preliminary Allocation of Purchase Price, 2015 (Details) - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
2015 Acquisitions [Member] | Scenario, Previously Reported [Member] | Customer Relationships [Member]
Intangible assets			$ 28,530,000
2015 Acquisitions [Member] | Scenario, Previously Reported [Member] | Trade Names [Member]
Intangible assets			1,965,000
2015 Acquisitions [Member] | Scenario, Previously Reported [Member] | Noncompete Agreements [Member]
Intangible assets			182,000
2015 Acquisitions [Member] | Scenario, Previously Reported [Member]
Equipment and leasehold improvements			1,513,000
Goodwill			24,296,000
Net deferred tax liability associated with step-up in book basis			(18,000)
Assets acquired and liabilities assumed, net			18,931,000
Business Combination, Consideration Transferred			$ 75,399,000
2015 Acquisitions [Member] | Scenario, Adjustment [Member] | Customer Relationships [Member]
Intangible assets
2015 Acquisitions [Member] | Scenario, Adjustment [Member] | Trade Names [Member]
Intangible assets
2015 Acquisitions [Member] | Scenario, Adjustment [Member] | Noncompete Agreements [Member]
Intangible assets
2015 Acquisitions [Member] | Scenario, Adjustment [Member]
Equipment and leasehold improvements
Goodwill			$ 489,000
Net deferred tax liability associated with step-up in book basis
Assets acquired and liabilities assumed, net			$ (218,000)
Business Combination, Consideration Transferred		$ 271,000	271,000
2015 Acquisitions [Member] | Customer Relationships [Member]
Intangible assets		28,530,000
2015 Acquisitions [Member] | Trade Names [Member]
Intangible assets		1,965,000
2015 Acquisitions [Member] | Noncompete Agreements [Member]
Intangible assets		182,000
2015 Acquisitions [Member]
Equipment and leasehold improvements		1,513,000
Goodwill		24,785,000
Net deferred tax liability associated with step-up in book basis		(18,000)
Assets acquired and liabilities assumed, net		18,713,000
Business Combination, Consideration Transferred		75,670,000	75,700,000
Goodwill	[1]	$ 581,379,000	$ 508,297,000

[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.