3. Income per share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation for Basic and Diluted Income Per Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in thousands, except per share amounts)
Net income	$	8,797	$	10,026	$	17,285	$	19,976
Weighted average basic shares outstanding		1,852		1,844		1,853		1,839
Add: Effect of dilutive securities		5		14		3		17
Weighted average diluted shares outstanding		1,857		1,858		1,856		1,856
Earnings per share:
Basic	$	4.75	$	5.44	$	9.33	$	10.86
Diluted	$	4.74	$	5.40	$	9.31	$	10.76