Note 11 - Stockholders' Equity - Reconciliation of Activity in Stockholders' Equity Accounts (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance		$ 29,562			$ 29,562
Net income (loss)	$ (363)		$ (109)		(940)	$ (296)
Net income (loss)	(363)		(109)		(940)	(296)
Balance	28,663				28,663
Common Stock [Member]
Balance	54	54	684	$ 684	54	684
Net income (loss)	0	0	0	0
Stock-based compensation expense	0	0	0	0
Net income (loss)	0	0	0	0
Balance	54	54	684	684	54	684
Additional Paid-in Capital [Member]
Balance	30,471	30,450	29,759	29,738	30,450	29,738
Net income (loss)	0	0	0	0
Stock-based compensation expense	20	21	21	21
Net income (loss)	0	0	0	0
Balance	30,491	30,471	29,780	29,759	30,491	29,780
Retained Earnings [Member]
Balance	(1,519)	(942)	(3,890)	(3,702)	(942)	(3,702)
Net income (loss)	(363)	(577)	(109)	(188)
Stock-based compensation expense	0	0	0	0
Net income (loss)	(363)	(577)	(109)	(188)
Balance	$ (1,882)	$ (1,519)	$ (3,999)	$ (3,890)	$ (1,882)	$ (3,999)