Note 2 - Accounting Policies and Related Matters (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Contract assets	$ 0	$ 0
Contract liabilities	1,252,000	860,000
Accounts receivable	1,874,000	1,812,000
Allowance for accounts receivables	$ 165,000	$ 75,000
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Component of derivative fair value adjustment	Component of derivative fair value adjustment
Component of derivative fair value adjustment	$ 2,638,000	$ 353,000
Properties reclassified as held for sale	0	0
Leasing commission costs	5,000
Impairment charges	0	0
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable	2,100,000	900,000
Allowance for accounts receivables	0	100,000
Deferred Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Contract liabilities	200,000	200,000
Intangible Lease Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Above -market lease gross value	5,200,000	4,800,000
In-place lease gross value	36,100,000	30,600,000
Unamortized Intangible Lease Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Below -market lease liabilities gross value	5,000,000.0	4,800,000
Rental Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Variable lease payments	$ 6,900,000	$ 4,900,000