Note 1 - Basis of Presentation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock-based compensation expense	$ 138	$ 196	$ 325	$ 507
Share-Based Payment Arrangement, Option [Member]
Stock-based compensation expense	0	1	0	(22)
Restricted Stock [Member]
Stock-based compensation expense	138	116	246	315
Performance Shares [Member]
Stock-based compensation expense	$ 0	$ 79	$ 79	$ 214