Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Customer Relationships [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	$ 1,480	$ 1,480
Finite-lived, Accumulated Amortization	1,248	1,116
Net Carrying Amount	232	314
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	1,248	1,116
Patented Technology [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	405	386
Net Carrying Amount	185	204
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	405	386
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	209	196
Net Carrying Amount	61	74
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	209	196
Trade Names [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	140	140
Finite-lived, Accumulated Amortization	140	138
Net Carrying Amount		2
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	140	138
Trademarks [Member]
Finite-lived intangible assets:
Indefinite-lived, Gross Carrying Amount	510	510
Indefinite-lived intangible assets:
Indefinite-lived, Gross Carrying Amount	510	510
Finite-lived, Gross Carrying Amount	2,480	2,480
Finite-lived, Accumulated Amortization	2,002	1,886
Net Carrying Amount	478	594
Intangible Assets, Gross Carrying Amount	2,990	2,990
Net Carrying Amount	988	1,104
Intangible Assets, Gross Carrying Amount	2,990	2,990
Finite-lived, Accumulated Amortization	2,002	1,886
Net Carrying Amount	$ 988	$ 1,104