Note 2 - Earnings Per Common Share (Detail) - Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Numerator:
Net income (in Dollars)	$ 7,584	$ 6,194	$ 13,030	$ 13,996	$ 10,289
Denominator:
Basic earnings per common share - weighted-average shares	22,066	21,984	22,050		21,974
Effect of dilutive stock options	100	101	104		104
Diluted earnings per common share - weighted-average shares and assumed conversions	22,166	22,085	22,154		22,078
Basic earnings per common share (in Dollars per share)	$ 0.34	$ 0.28	$ 0.59		$ 0.47
Diluted earnings per common share (in Dollars per share)	$ 0.34	$ 0.28	$ 0.59		$ 0.47