Note 2 - Earnings Per Common Share (Details) - Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Net income (in Dollars)	$ 7,977	$ 7,719	$ 6,518	$ 22,846	$ 19,548
Denominator:
Basic earnings per common share - weighted-average shares	33,226		33,107	33,206	33,085
Effect of dilutive stock options	249		116	183	140
Diluted earnings per common share - weighted-average shares and assumed conversions	33,475		33,223	33,389	33,225
Basic earnings per common share (in Dollars per share)	$ 0.24		$ 0.20	$ 0.69	$ 0.59
Diluted earnings per common share (in Dollars per share)	$ 0.24		$ 0.20	$ 0.68	$ 0.59