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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Real Estate Under Development Period After Completion Cessation of Cost Capitalization (Year) | 1 year |  |
Number of Portfolio Segments | 1 |  |
Financing Receivable Past Due Term (Day) | 90 days |  |
Capitalized Computer Software, Net, Ending Balance | $ 19,100 | $ 14,500 |
Capitalized Computer Software, Amortization | 3,200 | 1,700 | $ 5,300
Other Assets, Total | $ 97,225 | 194,682 |
Revision of Prior Period, Reclassification, Adjustment [Member] |  |  |
Other Assets, Total |  | 9,400 |
Other Income |  | $ 800 | $ (3,500)
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 Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |
Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 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 Rights, Percentage | 20.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 10 years |  |
The 2010 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares | 10,000,000 |  |
COVID 19 [Member] |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total | $ 81,000 |  |
COVID 19 [Member] | Straight-Line Rent Receivables [Member] |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 15,200 |  |
Minimum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 10 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 50 years |  |

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