Note 7 - Equity (Details Textual) - USD ($) $ in Millions		3 Months Ended
	Dec. 31, 2020	Mar. 31, 2020	Jan. 16, 2020	Mar. 31, 2019
Class Of Stock [Line Items]
Awards outstanding		70,000		0
2020 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance			3,620,000
Awards outstanding		0
2020 Equity Incentive Plan [Member] | Directors [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Shares granted	153,200
2020 Equity Incentive Plan [Member] | Restricted Shares [Member] | Directors [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Shares granted	153,200
Compensation expense	$ 0.1
Weighted average period of recognition	1 year
Operating Partnership [Member]
Class Of Stock [Line Items]
Operating partnership percentage		88.40%
Percentage of collectively owned in operating partnership by investors		11.60%