Note 8 - Equity (Details Textual)				12 Months Ended
	Apr. 01, 2022 USD ($) shares	Oct. 01, 2021 USD ($) shares	Oct. 01, 2021 USD ($) shares	Dec. 31, 2021 USD ($) Property $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jan. 03, 2022 shares	Sep. 15, 2021 shares	Jun. 04, 2021 $ / shares shares	Jul. 31, 2020 shares
Class Of Stock [Line Items]
Common stock, shares issued				31,873,428	22,624,679
Number of real estate properties | Property				15
Preferred stock, shares outstanding				500	500
Preferred stock, par value | $ / shares				$ 0.01	$ 0.01
Conversion price | $ / shares				$ 0.20
Common stock shares authorized for issuance				50,000,000	50,000,000
Warrants to purchase of common stock								200,000
Awards outstanding				70,000
Contractual life of warrants				4 years 3 months 18 days
Lamont Street [Member]
Class Of Stock [Line Items]
Warrants to purchase of common stock, Exercise price | $ / shares								$ 2.50
Directors [Member]
Class Of Stock [Line Items]
Common stock, shares issued	9,708					165,700
Maximum [Member]
Class Of Stock [Line Items]
Percentage of RSUs granted to executives			300.00%
Minimum [Member]
Class Of Stock [Line Items]
Percentage of RSUs granted to executives			0.00%
Restricted Stock Awards [Member]
Class Of Stock [Line Items]
Shares surrendered to satisfy tax obligations				11,917
Compensation expense related to these share-based payments | $				$ 300,000
Options granted				148,657	153,200
Value of award | $	$ 300,000
Unrecognized costs from stock-based awards | $				$ 100,000
Unrecognized compensation cost recognition period				4 months 24 days
Restricted Stock Awards [Member] | Executives [Member]
Class Of Stock [Line Items]
Value of award | $		$ 100,000	$ 100,000
Restricted Stock Awards [Member] | Employees [Member]
Class Of Stock [Line Items]
Options granted	138,262	58,140
Restricted Stock Awards [Member] | Maximum [Member]
Class Of Stock [Line Items]
Compensation expense related to these share-based payments | $					$ 1,000
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Unrecognized costs from stock-based awards | $				$ 4,900,000
Unrecognized compensation cost recognition period				4 years 1 month 6 days
Restricted Stock Units [Member] | Executives [Member]
Class Of Stock [Line Items]
Options granted			1,220,930
Restricted Stock Units [Member] | Maximum [Member]
Class Of Stock [Line Items]
Percentage of number of units granted at vesting date that entitle recipients to shares of common stock				300.00%
Restricted Stock Units [Member] | Minimum [Member]
Class Of Stock [Line Items]
Percentage of number of units granted at vesting date that entitle recipients to shares of common stock				0.00%
2020 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance							1,500,000
Common stock shares authorized for issuance				4,818,143
2020 Equity Incentive Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance							5,120,000
2020 Equity Incentive Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance							3,620,000
Operating Partnership [Member]
Class Of Stock [Line Items]
Operating partnership percentage				91.90%	88.90%
Percentage of collectively owned in operating partnership by investors				8.10%	11.10%
Series A Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares outstanding				500	500
Preferred stock, par value | $ / shares				$ 0.01	$ 0.01
Preferred stock, dividend rate percentage				10.00%
Preferred stock, per share issuance price | $ / shares				$ 100
Series A Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Preferred dividends undeclared | $				$ 100,000
Lamar Station Plaza East [Member]
Class Of Stock [Line Items]
Common stock, shares issued									884,143
2021 Real Estate Acquisitions [Member]
Class Of Stock [Line Items]
Common stock, shares issued				9,083,730
Number of real estate properties | Property				4
OP Unit Conversion [Member] | Operating Partnership [Member]
Class Of Stock [Line Items]
Stock Issued During Period, Shares, Conversion of Units		36,064
OP Unit Redemption [Member]
Class Of Stock [Line Items]
Common stock, shares issued	60,106			36,064
OP Unit Redemption [Member] | Operating Partnership [Member]
Class Of Stock [Line Items]
Common stock, shares issued	60,106