Note 4 - Goodwill and Intangible Assets (Details) - Estimated future amortization expense for the identifiable intangible assets: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Estimated future amortization expense for the identifiable intangible assets: [Abstract]
Remainder of 2013						$ 1,861
2014					3,663
2015				2,887
2016			2,139
2017		1,171
2018 and thereafter	$ 1,035