v3.26.3
Note 4 - Shareholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 08, 2016
Jun. 30, 2003
USD ($)
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2021
shares
Dec. 31, 2023
shares
Sep. 29, 2006
$ / shares
shares
Shares Authorized to Issue, Maximum     450,000,000        
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.01 $ 0.01      
Common Stock, Shares Authorized (in shares)     400,000,000 400,000,000      
Preferred Stock, Shares Authorized (in shares)     50,000,000        
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.01        
Pillarstone Capital R E I T Operating Partnership L P [Member] | General Partner [Member]              
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 18.60% 18.60%          
Chairman and Previous Chief Executive Officer and President and Previous Chief Financial Officer and Senior Vice President [Member] | Conversion of Series A Preferred Stock to Common Shares [Member]              
Conversion of Stock, Shares Converted (in shares)         534,668    
Conversion of Stock, Shares Issued (in shares)         163,116    
Restricted Stock [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period     0 0      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number     168,449 168,449   168,449  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested and Unexercised, Number of Shares     5,333        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Grant Date Fair Value | $     $ 79        
Restricted Stock [Member] | Vest Upon Meeting Performance Goals [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number     163,116        
Share-Based Payment Arrangement, Expense | $     $ 0        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Nonvested, Grant Date Fair Value | $     $ 1,800        
Series A Preferred Stock [Member]              
Preferred Stock, Shares Authorized (in shares)     1,518,000 1,518,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.01 $ 0.01      
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     256,636 256,636      
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares     $ 10 $ 10      
Series A Preferred Stock [Member] | Restricted Stock [Member] | Chairman and Previous Chief Executive Officer and President and Previous Chief Financial Officer and Senior Vice President [Member]              
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     161,410        
Deferred Compensation Arrangement with Individual, Shares Issued   696,078          
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued | $   $ 2,400          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Gross Assets | $   $ 50,000          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period     0        
Preferred Stock, Convertible, Conversion Ratio     0.305        
Series A Preferred Stock [Member] | Public Holders [Member]              
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     95,226        
Series A Preferred Stock [Member] | Other Holders [Member]              
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     95,226        
Preferred Stock, Convertible, Conversion Ratio     0.046        
Series C Preferred Stock [Member]              
Preferred Stock, Shares Authorized (in shares)     300,000 300,000     300,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.01 $ 0.01      
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     231,944 231,944      
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares     $ 10 $ 10     $ 10
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares             $ 1