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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 03, 2021
Apr. 15, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Combination, Acquisition Related Costs     $ (0) $ 50,191 $ (0)
Real Estate Under Development Period After Completion Cessation of Cost Capitalization (Year)     1 year    
Restricted Cash, Total     $ 2,900 9,000  
Land Held for Development From Real Estate Under Development to Land [Member]          
Prior Period Reclassification Adjustment       5,700  
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)     10,000,000    
Investment Cash Held as Collateral for Letters of Credit [Member]          
Restricted Cash, Total       6,500  
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    
Weingarten Realty Investors [Member]          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Per Each Acquired Company Share (in shares) 1.408 1.408      
Business Combination, Consideration Transferred, Cash Per Each Acquired Company Share (in dollars per share)   $ 2.20      
Business Combination, Acquisition Related Costs       $ 50,200 $ 50,200