Note 2 - Earnings Per Common Share (Details) - Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Numerator:
Net income (in Dollars)	$ 7,926	$ 7,667	$ 13,213	$ 15,278	$ 14,869
Denominator:
Basic earnings per common share - weighted-average shares	33,369	33,210	33,355		33,196
Effect of dilutive stock options	327	168	307		148
Diluted earnings per common share - weighted-average shares and assumed conversions	33,696	33,378	33,662		33,344
Basic earnings per common share (in Dollars per share)	$ 0.24	$ 0.23	$ 0.40		$ 0.45
Diluted earnings per common share (in Dollars per share)	$ 0.24	$ 0.23	$ 0.39		$ 0.45