Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended			6 Months Ended
	Jun. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2015 USD ($)
Conversion Ratio for Class Common Stock to OP Unit (in dollars per share) | $ / shares	$ 1			$ 1
Real Estate Inventory, Capitalized Interest Costs Incurred	$ 105,000		$ 101,000	$ 204,000	$ 203,000
Real Estate Taxes, Capitalized	75,000		71,000	150,000	150,000
Share-Based Payment Arrangement, Expense	841,000		1,244,000		2,712,000
Allocated Share-based Compensation Expense (Income)				(488,000)
Reversal of Share-based Compensation Expense for Forfeitures		$ 2,200,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	15,285,000			15,285,000		$ 14,896,000
Provision for Lease Losses	$ (125,000)		$ 143,000	$ 248,000	$ 672,000
Accounts Receivable, Credit Loss Expense (Reversal), Number of Tenants, COVID-19	76		56	76	56
Accounts Receivable, Credit Loss Expense (Reversal), COVID-19	$ 100,000		$ 100,000	$ 300,000	$ 600,000
Straight Line Rent Adjustments, COVID-19	$ 200,000		$ 100,000	$ 600,000	$ 200,000
Anthem Marketplace Note [Member]
Debt Instrument, Face Amount							$ 15,100,000
Debt Instrument, Interest Rate, Stated Percentage							4.99%