Note 5 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Intangible assets, net of accumulated amortization	$ 0	$ 71
Customer Relationships [Member]
Customer relationships, gross carrying amount	982	982
Customer relationships, accumulated amortization	(982)	(911)
Intangible assets, net of accumulated amortization	$ 0	$ 71