Note 4 - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Customer Relationships [Member]
Carrying Value	$ 24,025	$ 24,025	$ 23,701
Accumulated Amortization	(21,685)	(20,880)	(19,632)
Net Book Value	2,340	3,145	4,069
Customer Contracts [Member]
Carrying Value	19,600	19,600	19,600
Accumulated Amortization	$ (19,600)	$ (19,600)	$ (19,600)
Net Book Value
Noncompete Agreements [Member]
Carrying Value	$ 107	$ 107	$ 83
Accumulated Amortization	(95)	(89)	$ (83)
Net Book Value	12	18
Trade Names [Member]
Carrying Value	23	23	$ 9
Accumulated Amortization	(12)	(8)	(4)
Net Book Value	11	15	5
Carrying Value	43,755	43,755	43,393
Accumulated Amortization	(41,392)	(40,577)	(39,319)
Net Book Value	$ 2,363	$ 3,178	$ 4,074