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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares
Financing Receivable Past Due Term	90 days
Number of Portfolio Segments	1
Capitalized Computer Software, Net	$ 10,200	$ 16,100
Capitalized Computer Software, Amortization	$ 8,000	$ 10,700	$ 9,200
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares	3,490,400	5,300,680	7,137,120
Number of Equity Participation Plans	2
Amount of Ineffectiveness on Net Investment Hedges	$ 0	$ 0	$ 0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Restricted Stock [Member] \| i [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Restricted Stock [Member] \| ii [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock [Member] \| iii [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
Billed Accounts Receivable [Member]
Allowance for Doubtful Accounts Receivable	$ 12,300	13,900
Straight-line Rent Receivable [Member]
Allowance for Doubtful Accounts Receivable	$ 11,900	$ 17,900
Construction Completion [Member]
Number of Years	1 year
After Issuance [Member]
Number of Years	1 year
Maximum [Member]
Real Estate Acquisition, Fair Value Measurement, Adjustment Period	1 year
Maximum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Maximum [Member] \| Restricted Stock [Member] \| ii [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
Maximum [Member] \| Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life	50 years
Minimum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Minimum [Member] \| Restricted Stock [Member] \| ii [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
Minimum [Member] \| Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life	15 years