Note 3 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-lived, Gross Carrying Amount	$ 2,480	$ 2,480
Finite-lived, Accumulated Amortization	2,168	2,115
Net Carrying Amount	312	365
Intangible Assets, Gross Carrying Amount	2,990	2,990
Net Carrying Amount	822	875
Trademarks [Member]
Indefinite-lived, Gross Carrying Amount	510	510
Customer Relationships [Member]
Finite-lived, Gross Carrying Amount	1,480	1,480
Finite-lived, Accumulated Amortization	1,365	1,328
Net Carrying Amount	115	152
Patented Technology [Member]
Finite-lived, Gross Carrying Amount	590	590
Finite-lived, Accumulated Amortization	434	424
Net Carrying Amount	156	166
Computer Software, Intangible Asset [Member]
Finite-lived, Gross Carrying Amount	270	270
Finite-lived, Accumulated Amortization	229	223
Net Carrying Amount	41	47
Trade Names [Member]
Finite-lived, Gross Carrying Amount	140	140
Finite-lived, Accumulated Amortization	140	140
Net Carrying Amount	$ 0