Note 6 - Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill, Ending Balance	$ 57,935	$ 57,831	$ 58,021
Finite-lived intangible assets, gross	12,270	12,259
Finite-lived intangible assets, accumulated amortization	11,733	11,348
Finite-lived intangible assets, net	537	911
Total intangible assets other than goodwill	13,461	13,450
Total intangible assets other than goodwill	1,728	2,102
Customer Relationships [Member]
Finite-lived intangible assets, gross	9,338	9,327
Finite-lived intangible assets, accumulated amortization	9,154	9,011
Finite-lived intangible assets, net	$ 184	$ 316
Customer Relationships [Member] | Minimum [Member]
Finite-lived intangible assets, useful life (Year)	5 years	5 years
Customer Relationships [Member] | Maximum [Member]
Finite-lived intangible assets, useful life (Year)	15 years	15 years
Technology-Based Intangible Assets [Member]
Finite-lived intangible assets, useful life (Year)	7 years	7 years
Finite-lived intangible assets, gross	$ 1,360	$ 1,360
Finite-lived intangible assets, accumulated amortization	1,007	765
Finite-lived intangible assets, net	353	595
Trade Names [Member]
Finite-lived intangible assets, gross	1,572	1,572
Finite-lived intangible assets, accumulated amortization	1,572	$ 1,572
Finite-lived intangible assets, net
Trade Names [Member] | Minimum [Member]
Finite-lived intangible assets, useful life (Year)	5 years	5 years
Trade Names [Member] | Maximum [Member]
Finite-lived intangible assets, useful life (Year)	10 years	10 years
Trade Names 1 [Member]
Indefinite trade name	$ 1,191	$ 1,191