3. Income per share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Computation for Basic and Diluted Income Per Share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
	(in thousands, except per share amounts)
Net income	$	10,026	$	7,450	$	19,976	$	14,396
Weighted average basic shares outstanding		1,844		1,822		1,839		1,823
Add: Effect of dilutive securities		14		31		17		32
Weighted average diluted shares outstanding		1,858		1,853		1,856		1,855
Earnings per share:
Basic	$	5.44	$	4.09	$	10.86	$	7.90
Diluted	$	5.40	$	4.02	$	10.76	$	7.76