Note 5 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	$ 12,580	$ 12,580
Finite-lived, Accumulated Amortization	3,739	3,276
Net Carrying Amount	8,841	9,304
Indefinite-lived intangible assets:
Intangible Assets, Gross Carrying Amount	19,290	19,290
Finite-lived, Accumulated Amortization	3,739	3,276
Net Carrying Amount	15,551	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	2,177	1,828
Net Carrying Amount	8,303	8,652
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	2,177	1,828
Patented Technology [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	600	600
Finite-lived, Accumulated Amortization	176	95
Net Carrying Amount	424	505
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	176	95
Patents [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	483	463
Net Carrying Amount	107	127
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	483	463
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	263	250
Net Carrying Amount	7	20
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	263	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