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Note 7 - Credit Agreement (Details Textual)
1 Months Ended 12 Months Ended
May. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2011
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | Minimum [Member] | One-month LIBOR Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | Minimum [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | Maximum [Member] | One-month LIBOR Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.25%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | Maximum [Member]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member] | One-month LIBOR Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Revolving Credit Facility [Member] | The 2013 Credit Agreement [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 500,000,000      
Debt Instrument, Number of Incremental Term Loan Facilities Allowed 1        
Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.50%        
Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.25%        
Revolving Credit Facility [Member]          
Repayments of Long-term Lines of Credit   $ 0 $ 35,000,000    
The 2011 Credit Agreement [Member] | HealthDataInsights, Inc [Member]          
Debt Instrument, Term         5 years
The 2011 Credit Agreement [Member]          
Repayments of Long-term Debt $ 323,800,000        
Interest Paid 1,100,000        
The 2013 Credit Agreement [Member] | Minimum [Member]          
Line of Credit Facility, Additional Amount of Incremental Credit Facilities Under Specified Circumstances $ 25,000,000        
Debt Instrument, Covenant, Interest Coverage Ratio 3        
The 2013 Credit Agreement [Member] | Maximum [Member]          
Debt Instrument, Secured Leverage Ratio 2.5        
Debt Instrument Covenant, Consolidated Leverage Ratio Before Reduction 3.5        
Debt Instrument, Covenant, Consolidated Leverage Ratio 3.25        
The 2013 Credit Agreement [Member]          
Debt Instrument, Term 5 years        
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000,000        
Line of Credit Facility, Amount of Incremental Credit Facilities Under Specified Circumstances $ 75,000,000        
Debt Instrument, Covenant, Consolidated Leverage Ratio, Reduction Period 5 years        
Deferred Finance Costs, Gross $ 2,900,000        
Repayments of Long-term Lines of Credit   35,000,000 $ 95,000,000  
Amortization of Financing Costs   $ 2,084,000 2,084,000 3,077,000  
Long-term Line of Credit, Noncurrent   $ 197,796,000 $ 197,796,000    
Repayments of Long-term Debt   8,750,000  
Interest Paid   $ 5,694,000 $ 4,458,000 $ 9,520,000  
Deferred Finance Costs, Net   4,900,000 $ 6,900,000    
Letters of Credit Outstanding, Amount   $ 3,000,000