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Quarterly Financial Statements (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Statements
The following table presents a summary of our results of operations for our eight most recent quarters ended December 31, 2017. The information for each of these quarters is unaudited and has been prepared on a basis consistent with the audited financial statements. This information includes all adjustments, consisting only of normal recurring adjustments, we consider necessary for fair presentation of this information when read in conjunction with the audited financial statements and related notes. Our operating results have varied on a quarterly basis and may fluctuate significantly in the future.
 
(In thousands, except for per share data)
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
Year Ended December 31, 2017
 
 
 
 
 
 
 
Sales revenues
$
64,075

 
$
67,677

 
$
67,113

 
$
78,062

Gross profit
33,557

 
36,885

 
35,475

 
45,380

Operating income (loss)
3,234

 
4,448

 
5,622

 
(18,118
)
Net income (loss)
246

 
1,587

 
2,288

 
(21,537
)
Net income (loss) per share
 
 
 
 
 
 
 
Basic
$
0.02

 
$
0.11

 
$
0.17

 
$
(1.57
)
Diluted
0.02

 
0.11

 
0.17

 
(1.57
)
Year Ended December 31, 2016
 
 
 
 
 
 
 
Sales revenues
$
69,643

 
$
68,415

 
$
64,663

 
$
64,551

Gross profit
36,089

 
34,913

 
32,767

 
33,491

Operating income
776

 
5,263

 
4,244

 
4,092

Net income (loss)
(1,663
)
 
1,996

 
1,599

 
2,001

Net income (loss) per share
 
 
 
 
 
 
 
Basic
$
(0.13
)
 
$
0.15

 
$
0.12

 
$
0.15

Diluted
(0.13
)
 
0.15

 
0.12

 
0.15