Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information
Noncash deferred compensation expense	$ 155		$ 677	$ 544
Treasury shares	24,893			24,893
Treasury stock	$ 1,358			$ 1,358
Increase in accounts payable and accrued liabilities related to additions to real estate assets			5,719	789
Proceeds from tax refunds			202
Interest paid
Interest payments	576		7,018	6,932
Interest capitalized included in interest payments	12		$ 1,164	126
Retirement Benefits
Employer matching contribution, as a percentage of employee contribution			60.00%
Employer matching contribution as a percentage of base salary			5.00%
Contributions to the INDUS Savings Plan	9		$ 89	72
Deferred Compensation Plan
Liability under Deferred Compensation Plan	4,335		5,097	4,335
Expense for employer matching benefit to the Deferred Compensation Plan	1		9	12
Consolidated statement of operations data:
Rental revenue	3,345	$ 3,083	42,339	37,650
Expenses	(1,364)	(3,414)
Pretax income (loss)	1,981	(331)	14,170	(7,329)
Income tax benefit		76	26	3,152
Net income (loss)	$ 1,981	$ (255)	$ 14,144	$ (10,481)
Per share data:
Basic net income (loss) per common share	$ 0.35	$ (0.05)	$ 1.79	$ (1.97)
Diluted net income (loss) per common share	$ 0.34	$ (0.05)	$ 1.75	$ (1.97)
Weighted average shares outstanding - basic	5,663,000	5,075,000	7,908,000	5,309,000
Weighted average shares outstanding - diluted	5,844,000	5,075,000	8,081,000	5,309,000