Note 5 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	$ 12,580	$ 12,580
Finite-lived, Accumulated Amortization	3,492	3,276
Net Carrying Amount	9,088	9,304
Indefinite-lived intangible assets:
Intangible Assets, Gross Carrying Amount	19,290	19,290
Finite-lived, Accumulated Amortization	3,492	3,276
Net Carrying Amount	15,798	16,014
Trademarks [Member]
Indefinite-lived intangible assets:
Indefinite-lived, Gross Carrying Amount	6,710	6,710
Net Carrying Amount	6,710	6,710
Customer Relationships [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	10,480	10,480
Finite-lived, Accumulated Amortization	1,986	1,828
Net Carrying Amount	8,494	8,652
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	1,986	1,828
Patented Technology [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	600	600
Finite-lived, Accumulated Amortization	136	95
Net Carrying Amount	464	505
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	136	95
Patents [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	473	463
Net Carrying Amount	117	127
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	473	463
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	257	250
Net Carrying Amount	13	20
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	257	250
Trade Names [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	140	140
Finite-lived, Accumulated Amortization	140	140
Net Carrying Amount
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	140	140
Order or Production Backlog [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	500	500
Finite-lived, Accumulated Amortization	500	500
Net Carrying Amount
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	$ 500	$ 500