Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 01, 2016	Dec. 31, 2015
Customer Relationships [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	$ 1,480		$ 1,480
Finite-lived, Accumulated Amortization	1,288		1,166
Net Carrying Amount	192		314
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	1,288		1,166
Patented Technology [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	590		590
Finite-lived, Accumulated Amortization	415		386
Net Carrying Amount	175		204
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	415		386
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets:
Finite-lived, Gross Carrying Amount	270		270
Finite-lived, Accumulated Amortization	216		196
Net Carrying Amount	54		74
Indefinite-lived intangible assets:
Finite-lived, Accumulated Amortization	216		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	2,059		1,886
Net Carrying Amount	421		594
Intangible Assets, Gross Carrying Amount	2,990		2,990
Net Carrying Amount	931	$ 931	1,104
Intangible Assets, Gross Carrying Amount	2,990		2,990
Finite-lived, Accumulated Amortization	2,059		1,886
Net Carrying Amount	$ 931	$ 931	$ 1,104