Note 8 - Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended
	Oct. 01, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 15, 2021	Jun. 04, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, shares authorized		50,000,000	50,000,000			50,000,000
Awards outstanding		70,000	70,000
Minimum [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Percentage of RSUs granted to executives	0.00%
Maximum [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Percentage of RSUs granted to executives	300.00%
Restricted Stock Awards [Member]
Class Of Stock [Line Items]
Stock-based award activity		213,545	213,545			153,200
Shares surrendered to satisfy tax obligations			7,136
Compensation expense related to these share-based payments		$ 0.1	$ 0.2
Unrecognized costs from stock-based awards		$ 0.1	$ 0.1
Unrecognized compensation cost recognition period			4 months 24 days
Granted to executives			90,517
Restricted Stock Awards [Member] | Subsequent Event [Member] | Executives [Member]
Class Of Stock [Line Items]
Granted to executives	58,140
Value of award	$ 0.1
Restricted Stock Units [Member] | Subsequent Event [Member] | Executives [Member]
Class Of Stock [Line Items]
Granted to executives	1,220,930
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%
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%
2020 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance				1,500,000
Common stock, shares authorized		4,876,283	4,876,283
2020 Equity Incentive Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Common stock shares available for issuance				3,620,000
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] | Restricted Stock Awards [Member]
Class Of Stock [Line Items]
Stock-based award activity		0	0
Operating Partnership [Member]
Class Of Stock [Line Items]
Operating partnership percentage			91.10%
Percentage of collectively owned in operating partnership by investors			8.90%
Operating partnership units redeemed			0
Lamont Street [Member]
Class Of Stock [Line Items]
Warrants to purchase of common stock					200,000
Warrants to purchase of common stock, Exercise price					$ 2.50