v3.26.1
Note 9 - Shareholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended 243 Months Ended
Dec. 27, 2021
$ / shares
shares
Dec. 08, 2016
Jun. 30, 2003
USD ($)
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2021
shares
Sep. 29, 2006
$ / shares
shares
Shares Authorized to Issue, Maximum       450,000,000   450,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01 $ 0.01 $ 0.01    
Common Stock, Shares Authorized (in shares)       400,000,000 400,000,000 400,000,000    
Preferred Stock, Shares Authorized (in shares)       50,000,000   50,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01   $ 0.01    
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       168,449 168,449 168,449 168,449  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested and Unexercised, Number of Shares       5,333   5,333    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Grant Date Fair Value | $       $ 79   $ 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   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   $ 1,800    
Series A Preferred Stock [Member]                
Preferred Stock, Shares Authorized (in shares)       1,518,000 1,518,000 1,518,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01 $ 0.01 $ 0.01    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       256,636 256,636 256,636    
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares       $ 10 $ 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   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   0.305    
Series A Preferred Stock [Member] | Public Holders [Member]                
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       95,226   95,226    
Series A Preferred Stock [Member] | Other Holders [Member]                
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       95,226   95,226    
Preferred Stock, Convertible, Conversion Ratio       0.046   0.046    
Series C Preferred Stock [Member]                
Preferred Stock, Shares Authorized (in shares)       300,000 300,000 300,000   300,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01     $ 0.01 $ 0.01 $ 0.01    
Preferred Stock, Convertible, Conversion Price | $ / shares               $ 1
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       231,944 231,944 231,944    
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares       $ 10 $ 10 $ 10   $ 10
Preferred Share Purchase Right [Member]                
Stock Dividends, Shares 1              
Preferred Unit, Convertible, Conversion Ratio 1              
Preferred Stock, Convertible, Conversion Price | $ / shares $ 7              
Preferred Stock, Exercisable Period 10 days              
Preferred Stock, Convertible, Maximum Beneficial Ownership 5.00%              
Preferred Stock, Convertible, Market Value, Multiplier of Purchase Price 2              
Preferred Stock, Convertible, Percentage of Consolidated Assets 50.00%              
Preferred Share Purchase Right [Member] | Certain Passive Institutional Investors [Member]                
Preferred Stock, Convertible, Maximum Beneficial Ownership 20.00%              
Series D Preferred Stock [Member]                
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]                
General Partners' Capital Account, Units Outstanding       16,688,167   16,688,167    
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest   18.60%   18.60%