Note 7 - Equity (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Class Of Stock [Line Items]
Common stock, shares authorized	50,000,000	50,000,000
Awards outstanding	70,000
Restricted Stock Awards [Member]
Class Of Stock [Line Items]
Stock-based award activity	153,200	153,200
Compensation expense related to these share-based payments	$ 21,000
Unrecognized compensation cost recognition period	9 months 18 days
Restricted Stock Awards [Member] | Maximum [Member]
Class Of Stock [Line Items]
Unrecognized costs from stock-based awards	$ 100,000
2020 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance	3,620,000
Common stock, shares authorized			3,466,800
2020 Equity Incentive Plan [Member] | Restricted Stock Awards [Member]
Class Of Stock [Line Items]
Stock-based award activity			0
Operating Partnership [Member]
Class Of Stock [Line Items]
Operating partnership percentage	88.90%
Percentage of collectively owned in operating partnership by investors	11.10%