Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss	$ (5,466,000)	$ (1,637,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	10,702,000	10,225,000
Noncash impairment charge	3,000,000
Change in fair value of financial instruments	2,746,000	570,000
Gain on sales of real estate assets	(1,792,000)	(825,000)
Noncash rental revenue including straight-line rents	(1,610,000)	(1,942,000)
Amortization of debt issuance costs	819,000	324,000
Stock-based compensation expense	810,000	407,000
Deferred income taxes		(456,000)
Changes in assets and liabilities:
Other assets	(3,517,000)	(1,863,000)
Accounts payable and accrued liabilities	(331,000)	(348,000)
Deferred revenue	1,371,000	1,902,000
Other liabilities	553,000	(450,000)
Net cash provided by operating activities	7,285,000	5,907,000
Investing activities:
Acquisitions of land and buildings	(77,954,000)	(13,670,000)
Additions to real estate assets	(33,692,000)	(9,137,000)
Proceeds from sales of real estate assets, net of expenses	9,982,000	1,094,000
Deposits on building and land acquisitions	(6,455,000)	(365,000)
Deferred leasing costs and other	(2,490,000)	(1,166,000)
Changes in short-term investments, net		1,011,000
Net cash used in investing activities	(110,609,000)	(22,233,000)
Financing activities:
Proceeds from sale of common stock	108,676,000	27,281,000
Proceeds from mortgage loans	14,662,000	20,100,000
Dividends paid to stockholders	(5,721,000)
Principal payments on mortgage loans	(3,826,000)	(6,703,000)
Payment of debt issuance costs	(1,863,000)	(363,000)
Net repayment on revolving lines of credit		(3,000,000)
Proceeds from sale of warrants		2,018,000
Proceeds from exercise of stock options	407,000	210,000
Net cash provided by financing activities	112,335,000	39,543,000
Net increase in cash and cash equivalents	9,011,000	23,217,000
Cash and cash equivalents at beginning of period	28,124,000	4,837,000
Cash and cash equivalents at end of period	$ 37,135,000	$ 28,054,000