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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 |  |

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