Note 1 - Organization and Significant Accounting Policies - Calculation of Diluted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 2,667	$ (1,657)
Amount attributable to unvested restricted shares	(135)	0
Amount attributable to warrants outstanding	(82)	0
Net income (loss) allocated to common shareholders	$ 2,450	$ (1,657)
Weighted-average common shares issued and outstanding (in shares)	27,306,258	19,460,299
Basic earnings (loss) per common share (in dollars per share)	$ 0.09	$ (0.09)
Amount attributable to warrants	$ (20)	$ 0
Less: gain related to change in fair value of warrants	(3,601)	0
Diluted loss allocated to common shareholders	$ (954)	$ (1,657)
Diluted loss per common share (in dollars per share)	$ (0.03)	$ (0.09)