Note 13 - Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015		Dec. 31, 2015
UNITED STATES
Revenues	[1]	$ 149,440		$ 121,718
Segment profit	[1]	22,905		19,522
Depreciation and amortization expense	[1]	10,752		9,411
Capital expenditures	[1]	(1,178)		(1,670)
Total assets	[1],[2]	702,747		598,165
Long-lived assets (2)(3)	[1],[2],[3]	570,681		471,040
CANADA
Revenues	[1]	9,454		7,949
Segment profit	[1]	968		634
Depreciation and amortization expense	[1]	56		582
Capital expenditures	[1]	(27)		(114)
Total assets	[1],[2]	29,341		22,343
Long-lived assets (2)(3)	[1],[2],[3]	17,515		15,613
UNITED KINGDOM
Revenues	[1]	47,933		47,444
Segment profit	[1]	9,779		7,699
Depreciation and amortization expense	[1]	3,539		2,383
Capital expenditures	[1]	(178)		(189)
Total assets	[1],[2]	295,222		236,186
Long-lived assets (2)(3)	[1],[2],[3]	133,337		92,703
AUSTRALIA
Revenues	[1]	19,676		19,205
Segment profit	[1]	3,832		4,097
Depreciation and amortization expense	[1]	2,289		2,472
Capital expenditures	[1]	(1,354)		(256)
Total assets	[1],[2]	86,450		83,228
Long-lived assets (2)(3)	[1],[2],[3]	63,192		68,227
Revenues	[1]	226,503		196,316
Segment profit	[1]	37,484		31,952
Depreciation and amortization expense	[1]	16,636		14,848
Capital expenditures	[1]	(2,737)		(2,229)
Total assets		1,113,760	[1],[2]	939,922	[1],[2]	$ 1,044,807
Long-lived assets (2)(3)	[1],[2],[3]	$ 784,725		$ 647,583

[1] For segment purposes, the Company defines "segment profit" as earnings before interest expenses, income taxes, depreciation and amortization, share-based compensation expenses, acquisition related transaction costs and other expenses. A consolidated reconciliation from segment profit to income from operations is included below.

[2] Total assets and long-lived assets include goodwill. 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.

[3] Long-lived assets are noncurrent assets excluding deferred tax assets and deferred financing costs.