Note 5 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	$ 12,580	$ 12,580
Finite-lived, Accumulated Amortization	4,379	3,276
Net Carrying Amount	8,201	9,304	$ 365
Indefinite-lived intangible assets:
Intangible Assets, Gross Carrying Amount	19,290	19,290
Finite-lived, Accumulated Amortization	4,379	3,276
Net Carrying Amount	14,911	16,014
Trademarks [Member]
Finite-lived intangible assets:
Finite-lived, Accumulated Amortization
Indefinite-lived intangible assets:
Indefinite-lived, Gross Carrying Amount	6,710	6,710
Net Carrying Amount	6,710	6,710
Finite-lived, Accumulated Amortization
Customer Relationships [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	10,480	10,480
Finite-lived, Accumulated Amortization	2,717	1,828
Net Carrying Amount	7,763	8,652
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	2,717	1,828
Patented Technology [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	600	600
Finite-lived, Accumulated Amortization	250	95
Net Carrying Amount	350	505
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	250	95
Patents [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	502	463
Net Carrying Amount	88	127
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	502	463
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	270	250
Net Carrying Amount		20
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	270	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