3. Income per share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Computation for Basic and Diluted Income Per Share

	Three months ended March 31,
	2016		2015
	(in thousands, except per share amounts)
Net income	$	6,945	$	7,602
Weighted average basic shares outstanding		1,823		1,875
Add:  Effect of dilutive securities		26		20
Weighted average diluted shares outstanding		1,849		1,895

Earnings per share:
Basic	$	3.81	$	4.05
Diluted	$	3.76	$	4.01