Note 6 - Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Trade name	$ 1,191	$ 1,191
Total other intangible assets	13,463	13,470
Accumulated amortization	(10,867)	(10,706)
Other intangible assets, net	2,596	2,764
Customer Relationships [Member]
Intangible assets	9,340	9,347
Technology-Based Intangible Assets [Member]
Intangible assets	1,360	1,360
Trade Names [Member]
Intangible assets	$ 1,572	$ 1,572