Note 3 - Acquisitions (Details) (USD $)	12 Months Ended						72 Months Ended			66 Months Ended	1 Months Ended			12 Months Ended			0 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2013	Feb. 28, 2011 Accrued [Member] MES Group [Member]	Dec. 31, 2011 Accrued [Member] Other 2011 Acquisitions [Member]	Dec. 31, 2013 Southwest Medical Acquisition [Member]	Feb. 28, 2011 MES Group [Member]	Dec. 31, 2011 MES Group [Member]	Dec. 31, 2010 MES Group [Member]	Dec. 31, 2013 Other 2011 Acquisitions [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member]	May 10, 2011 Premex Group [Member]	Dec. 31, 2011 National IME Centres Inc. [Member]	Dec. 31, 2013 Related to 2012 Acquisition [Member]	Dec. 31, 2012 Related to 2012 Acquisition [Member]	Dec. 31, 2012 MedHealth Holdings [Member]	Dec. 31, 2012 Parthenia Medical Group [Member]	Dec. 31, 2013 Acquisitions 2013 [Member]	Dec. 31, 2013 Other 2013 Acquisition [Member]	Dec. 31, 2013 Pro Forma Additional Expenses [Member]	Dec. 31, 2012 Pro Forma Additional Expenses [Member]
Note 3 - Acquisitions (Details) [Line Items]
Number of Businesses Acquired	2	3	9	14	11	3	46			46
Business Acquisition, Percentage of Voting Interests Acquired												100.00%					100.00%	100.00%			100.00%	100.00%
Business Combination, Consideration Transferred		$ 109,500,000									$ 215,000,000				$ 43,200,000		$ 108,400,000		$ 350,000				$ 7,700,000
Payments to Acquire Businesses, Gross		112,300,000									175,000,000				44,600,000		66,500,000						3,300,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)		6,190									1,424,501				214,926		661,610
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		85,000									30,000,000				2,000,000		15,100,000
Closing Price Per Share (in Dollars per share)											$ 21.07						$ 22.85
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities											10,000,000						26,800,000						4,400,000
Business Acquisition, Transaction Costs		1,300,000						2,000,000	659,000			535,000	1,500,000		562,000	55,000	646,000						83,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount		18,300,000														54,600,000			59,100,000					3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents															564,000								8,000
Reduction Of Total Consideration Paid		1,500,000
Business Acquisition Purchase Price Allocation Intangible Assets Expected Tax Deductible Amount	50,200,000	20,800,000					50,200,000																	3,900,000
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents		2,900,000
Business Combination, Acquisition Related Costs	2,134,000	1,655,000	3,107,000																28,000	1,300,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual														301,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual																								28,000
Interest Expense		2,200,000	1,900,000																						125,000	5,200,000
Depreciation, Depletion and Amortization	62,748,000	58,551,000	47,439,000																						1,000,000	10,500,000
Selling, General and Administrative Expense	$ 133,870,000	$ 113,510,000	$ 84,133,000																						$ 1,900,000	$ 4,200,000