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Business Segments Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
segment
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]          
Number of Operating Segments | segment     2    
Revenues:          
Real estate operations $ 6,887 $ 892 $ 14,831 $ 8,216  
Leasing operations 3,090 5,376 9,370 15,057  
Unaffiliated customers 9,977 6,268 24,201 23,273  
Cost of sales 7,578 4,347 16,230 14,483  
Depreciation 907 1,472 2,664 4,624  
General and administrative expenses 3,602 5,252 10,213 15,797  
Gain on sale of assets 0 0 (4,812) (22,931)  
Operating income (loss) (2,830) (5,428) (814) 10,675  
Development of Real Estate Properties and Capital Improvements 17,517 30,292      
Total assets 462,837 559,100 462,837 559,100 $ 541,226
Cash and cash equivalents 63,537   63,537   24,229
Assets held for sale - discontinued operations 0   0   $ 151,053
Consulting, Legal And Public Relation Expense       3,800  
Impairment of real estate 720 625 720 625  
Deferred Profit Sharing          
Revenues:          
Share-based Payment Arrangement, Expense 242 2,691 478 3,862  
Deferred Profit Sharing | General and Administrative Expense          
Revenues:          
Share-based Payment Arrangement, Expense 135 2,751 269 3,495  
The Santal | Discontinued Operations, Held-for-sale          
Revenues:          
Assets held for sale - discontinued operations   67,300   67,300  
Block 21 | Discontinued Operations, Held-for-sale          
Revenues:          
Assets held for sale - discontinued operations   147,800   147,800  
Leasing Operations          
Revenues:          
Leasing operations 3,090 5,376 9,370 15,057  
Eliminations and Other          
Revenues:          
Real estate operations 0 0 0 0  
Cost of sales (4) (25) (4) (25)  
Depreciation (4) (14) (13) (50)  
General and administrative expenses 3,602 5,252 10,213 15,797  
Gain on sale of assets     0 0  
Operating income (loss) (3,594) (5,213) (10,202) (15,731)  
Development of Real Estate Properties and Capital Improvements 0 210 213 475  
Total assets 76,502 167,620 76,502 167,620  
Impairment of real estate 0 0 0 0  
Operating Segments          
Revenues:          
Development of Real Estate Properties and Capital Improvements     57,183 37,549  
Operating Segments | Real Estate Operations          
Revenues:          
Real estate operations 6,887 892 14,831 8,216  
Cost of sales 6,232 2,134 13,030 8,026  
Depreciation 24 37 73 149  
General and administrative expenses 0 0 0 0  
Gain on sale of assets     0 0  
Operating income (loss) (89) (1,904) 1,014 (575)  
Development of Real Estate Properties and Capital Improvements 6,203 25,962 18,294 30,841  
Total assets 274,397 211,423 274,397 211,423  
Impairment of real estate 720 625 720 625  
Operating Segments | Leasing Operations          
Revenues:          
Leasing operations 3,090 5,376 9,370 15,057  
Cost of sales 1,350 2,238 3,204 6,482  
Depreciation 887 1,449 2,604 4,525  
General and administrative expenses 0 0 0 0  
Gain on sale of assets     (4,812) (22,931)  
Operating income (loss) 853 1,689 8,374 26,981  
Development of Real Estate Properties and Capital Improvements 11,314 4,120 38,676 6,233  
Total assets 111,938 180,057 111,938 180,057  
Impairment of real estate $ 0 $ 0 0 0  
Eliminations and Other          
Revenues:          
Intersegment     0 0  
Eliminations and Other | Real Estate Operations          
Revenues:          
Intersegment     6 9  
Eliminations and Other | Leasing Operations          
Revenues:          
Intersegment     0 0  
Eliminations and Other | Eliminations and Other          
Revenues:          
Intersegment     $ (6) $ (9)