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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real Estate Under Development Period After Completion Cessation of Cost Capitalization 1 year    
Financing Receivable Past Due Term 90 days    
Number of Portfolio Segments 1    
Capitalized Computer Software, Net $ 6,200 $ 10,200  
Capitalized Computer Software, Amortization 4,600 8,000 $ 10,700
Amount of Ineffectiveness on Net Investment Hedges $ 0 $ 0 $ 0
Number of Equity Participation Plans 2    
Fee Income as a Percentage of Revenue 3.00% 3.00%  
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax $ (1,136) $ 406  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years    
Restricted Stock [Member] | Share-based Compensation Award, Vesting on Fourth or Fifth Anniversary [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%    
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Restricted Stock [Member] | Share-based Compensation Award, Vesting After the Fifth Anniversary [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%    
Prior Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 47,000,000    
The 2010 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 10,000,000    
After Issuance [Member]      
Redeemable Noncontrolling Units Redemption Period 1 year    
Billed Accounts Receivable [Member]      
Allowance for Doubtful Accounts Receivable $ 9,200 12,300  
Straight-line Rent Receivable [Member]      
Allowance for Doubtful Accounts Receivable $ 7,900 $ 11,900  
Minimum [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Minimum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Minimum [Member] | Computer Software, Intangible Asset [Member]      
Finite-Lived Intangible Asset, Useful Life 3 years    
Maximum [Member] | Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Maximum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Maximum [Member] | Computer Software, Intangible Asset [Member]      
Finite-Lived Intangible Asset, Useful Life 5 years    
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 15 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 50 years