Note 2 - Earnings Per Common Share (Detail) - Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income (in Dollars)	$ 6,518	$ 7,663	$ 6,333	$ 19,548	$ 16,622
Denominator:
Basic earnings per common share - weighted-average shares	22,071		21,985	22,057	21,978
Effect of dilutive stock options	77		89	93	100
Diluted earnings per common share - weighted-average shares and assumed conversions	22,148		22,074	22,150	22,078
Basic earnings per common share (in Dollars per share)	$ 0.30		$ 0.29	$ 0.89	$ 0.76
Diluted earnings per common share (in Dollars per share)	$ 0.29		$ 0.29	$ 0.88	$ 0.75