Note 5 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible assets, less accumulated amortization	$ 120	$ 169
Customer Relationships [Member]
Customer relationships, gross carrying amount	1,275	1,275
Customer relationships, accumulated amortization	(1,155)	(1,106)
Intangible assets, less accumulated amortization	$ 120	$ 169