Note 1 - Basis of Presentation - Impact of Adoption on Previously Reported Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Provision for income taxes	$ 4,614	$ 5,633
Net income	10,177	9,891
Comprehensive income, net of tax	$ 10,549	$ 8,974
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.52
Diluted earnings per share (in dollars per share)	$ 0.52	$ 0.51
Diluted weighted average shares outstanding (in shares)	19,423	19,273
Net cash used in operating activities	$ 6,705	$ (13,377)
Net cash provided by financing activities	$ (1,919)	18,724
Scenario, Previously Reported [Member]
Provision for income taxes		5,837
Net income		9,687
Comprehensive income, net of tax		$ 8,770
Basic earnings per share (in dollars per share)		$ 0.51
Diluted earnings per share (in dollars per share)		$ 0.50
Diluted weighted average shares outstanding (in shares)		19,293
Net cash used in operating activities		$ (13,581)
Net cash provided by financing activities		$ 18,928