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	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income (in Dollars)	$ 7,652	$ 7,977	$ 7,301	$ 20,865	$ 22,846
Denominator:
Basic earnings per common share - weighted-average shares	33,403	33,226		33,371	33,206
Effect of dilutive stock options	289	249		301	183
Diluted earnings per common share - weighted-average shares and assumed conversions	33,692	33,475		33,672	33,389
Basic earnings per common share (in Dollars per share)	$ 0.23	$ 0.24		$ 0.63	$ 0.69
Diluted earnings per common share (in Dollars per share)	$ 0.23	$ 0.24		$ 0.62	$ 0.68