Note 5 - Other Intangible Assets - Carrying Value of Definite Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Asset, Useful Life
Gross amount	$ 2,987	$ 2,987
Accumulated amortization	(2,669)	(2,351)
Net balance	$ 318	636
Patents [Member]
Finite-Lived Intangible Asset, Useful Life	14 years
Gross amount	$ 429	429
Accumulated amortization	(429)	(429)
Net balance
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Gross amount	$ 512	512
Accumulated amortization	(449)	(387)
Net balance	$ 63	125
Customer Lists [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Gross amount	$ 2,046	2,046
Accumulated amortization	(1,791)	(1,535)
Net balance	$ 255	$ 511