Note 9 - Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortizable Intangible Assets, Gross Carrying Amount	$ 84,246	$ 78,862
Amortizable Intangible Assets, Accumulated Amortization	(61,525)	(50,853)
Indefinite-Lived Intangible Assets Not Subject to Amortization	32	30
Total Intangible Assets, Gross Carrying Amount	84,278	78,892
Licenses and Other [Member]
Indefinite-Lived Intangible Assets Not Subject to Amortization	32	30
Customer Relationships [Member]
Amortizable Intangible Assets, Gross Carrying Amount	45,209	42,614
Amortizable Intangible Assets, Accumulated Amortization	(33,997)	(28,804)
Customer Contracts [Member]
Amortizable Intangible Assets, Gross Carrying Amount	38,362	35,499
Amortizable Intangible Assets, Accumulated Amortization	(26,853)	(21,300)
Noncompete Agreements [Member]
Amortizable Intangible Assets, Gross Carrying Amount	675	749
Amortizable Intangible Assets, Accumulated Amortization	$ (675)	$ (749)