Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2015			2014			2013
	(In thousands, except per share data)
Net income, as reported	$	46,209		$	44,239		$	37,752
Divided by:
Weighted average common shares outstanding		29,106			29,788			30,047
Weighted average common stock equivalents		20			29			26
Total weighted average common shares outstanding and common stock equivalents		29,126			29,817			30,073
Basic earnings per common share	$	1.59		$	1.49		$	1.26
Diluted earnings per common share	$	1.59		$	1.48		$	1.26
Dividend Payout ratio		40.3	%		40.3	%		41.3	%