Note 2 - Significant Accounting Policies - Basic and Diluted Earnings (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net loss attributable to common stockholders	$ (881)	$ (1,057)	$ (4,817)	$ (3,494)
Less: income attributable to participating securities	(322)	(280)	(967)	(688)
Subtotal	$ (1,203)	$ (1,337)	$ (5,784)	$ (4,182)
Weighted-average common shares outstanding (in shares)	16,063	16,063	16,063	16,063
Basic and diluted net loss per share (in dollars per share)	$ (0.07)	$ (0.08)	$ (0.36)	$ (0.26)